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122-410: In a commercial context (i.e., an airline or air freight carrier ), payload may refer only to revenue-generating cargo or paying passengers. A payload of ordnance carried by a combat aircraft is sometimes alternatively referred to as the aircraft's warload . For a rocket, the payload can be a satellite , space probe , or spacecraft carrying humans, animals, or cargo. For a ballistic missile ,

244-459: A free balloon flight. He found the ionization rate increased to twice the rate at ground level. Hess ruled out the Sun as the radiation's source by making a balloon ascent during a near-total eclipse. With the moon blocking much of the Sun's visible radiation, Hess still measured rising radiation at rising altitudes. He concluded that "The results of the observations seem most likely to be explained by

366-473: A Comet 4, and Pan Am followed on 26 October with a Boeing 707 service between New York and Paris. The next big boost for the airlines would come in the 1970s, when the Boeing 747 , McDonnell Douglas DC-10 , and Lockheed L-1011 inaugurated widebody ("jumbo jet") service, which is still the standard in international travel. The Tupolev Tu-144 and its Western counterpart, Concorde , made supersonic travel

488-459: A balloon. On 1 April 1935, he took measurements at heights up to 13.6 kilometres using a pair of Geiger counters in an anti-coincidence circuit to avoid counting secondary ray showers. Homi J. Bhabha derived an expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering . His classic paper, jointly with Walter Heitler , published in 1937 described how primary cosmic rays from space interact with

610-463: A characteristic energy maximum of 2 GeV, indicating their production in a fundamentally different process from cosmic ray protons, which on average have only one-sixth of the energy. There is no evidence of complex antimatter atomic nuclei, such as antihelium nuclei (i.e., anti-alpha particles), in cosmic rays. These are actively being searched for. A prototype of the AMS-02 designated AMS-01 ,

732-430: A crusade to create an air network that would link America to the world, and he achieved this goal through his airline, Pan Am , with a fleet of flying boats that linked Los Angeles to Shanghai and Boston to London . Pan Am and Northwest Airways (which began flights to Canada in the 1920s) were the only U.S. airlines to go international before the 1940s. With the introduction of the Boeing 247 and Douglas DC-3 in

854-585: A decay of primary cosmic rays as they impact an atmosphere, include photons, hadrons , and leptons , such as electrons , positrons, muons, and pions . The latter three of these were first detected in cosmic rays. Primary cosmic rays mostly originate from outside the Solar System and sometimes even outside the Milky Way . When they interact with Earth's atmosphere, they are converted to secondary particles. The mass ratio of helium to hydrogen nuclei, 28%,

976-444: A difference between the intensities of cosmic rays arriving from the east and the west that depends upon the charge of the primary particles—the so-called "east–west effect". Three independent experiments found that the intensity is, in fact, greater from the west, proving that most primaries are positive. During the years from 1930 to 1945, a wide variety of investigations confirmed that the primary cosmic rays are mostly protons, and

1098-449: A downturn in the nation's economy occurred. New start-ups entered during the downturn, during which time they found aircraft and funding, contracted hangar and maintenance services, trained new employees, and recruited laid-off staff from other airlines. Major airlines dominated their routes through aggressive pricing and additional capacity offerings, often swamping new start-ups. In the place of high barriers to entry imposed by regulation,

1220-506: A few antiprotons in primary cosmic rays, amounting to less than 1% of the particles in primary cosmic rays. These do not appear to be the products of large amounts of antimatter from the Big Bang, or indeed complex antimatter in the universe. Rather, they appear to consist of only these two elementary particles, newly made in energetic processes. Preliminary results from the presently operating Alpha Magnetic Spectrometer ( AMS-02 ) on board

1342-575: A gift from the taxpayers. (Passenger carriers operating scheduled service received approximately $ 4 billion, subject to tax.) In addition, the ATSB approved loan guarantees to six airlines totaling approximately $ 1.6 billion. Data from the U.S. Treasury Department show that the government recouped the $ 1.6 billion and a profit of $ 339 million from the fees, interest and purchase of discounted airline stock associated with loan guarantees. The three largest major carriers and Southwest Airlines control 70% of

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1464-461: A major international carrier. In 1933, Aéropostale went bankrupt , was nationalized and merged into Air France . Although Germany lacked colonies, it also began expanding its services globally. In 1931, the airship Graf Zeppelin began offering regular scheduled passenger service between Germany and South America, usually every two weeks, which continued until 1937. In 1936, the airship Hindenburg entered passenger service and successfully crossed

1586-611: A newly created Air Transportation Stabilization Board (ATSB). The applications to DOT for reimbursements were subjected to rigorous multi-year reviews not only by DOT program personnel but also by the Government Accountability Office and the DOT Inspector General. Ultimately, the federal government provided $ 4.6 billion in one-time, subject-to-income-tax cash payments to 427 U.S. air carriers, with no provision for repayment, essentially

1708-552: A proving flight across the English Channel , despite a lack of support from the British government. Flown by Lt. H Shaw in an Airco DH.9 between RAF Hendon and Paris – Le Bourget Airport , the flight took 2 hours and 30 minutes at £21 per passenger. On August 25, 1919, the company used DH.16s to pioneer a regular service from Hounslow Heath Aerodrome to Paris's Le Bourget , the first regular international service in

1830-547: A reality. Concorde first flew in 1969 and operated through 2003. In 1972, Airbus began producing Europe's most commercially successful line of airliners to date. The added efficiencies for these aircraft were often not in speed, but in passenger capacity, payload, and range. Airbus also features modern electronic cockpits that were common across their aircraft to enable pilots to fly multiple models with minimal cross-training. The 1978 U.S. airline industry deregulation lowered federally controlled barriers for new airlines just as

1952-500: A result of the terrorist attacks. This resulted in the first government bailout of the 21st century. Between 2000 and 2005 US airlines lost $ 30 billion with wage cuts of over $ 15 billion and 100,000 employees laid off. In recognition of the essential national economic role of a healthy aviation system, Congress authorized partial compensation of up to $ 5 billion in cash subject to review by the U.S. Department of Transportation and up to $ 10 billion in loan guarantees subject to review by

2074-501: A secondary shower of particles in multiple detectors at the same time is an indication that all of the particles came from that event. Cosmic rays impacting other planetary bodies in the Solar System are detected indirectly by observing high-energy gamma ray emissions by gamma-ray telescope. These are distinguished from radioactive decay processes by their higher energies above about 10 MeV. The flux of incoming cosmic rays at

2196-467: A serious competitive threat to the legacy carriers. However, of these, ATA and Skybus have since ceased operations. Increasingly since 1978, US airlines have been reincorporated and spun off by newly created and internally led management companies, and thus becoming nothing more than operating units and subsidiaries with limited financially decisive control. Among some of these holding companies and parent companies which are relatively well known, are

2318-413: A single power law", suggesting a more complex process of cosmic ray formation. In February 2013, though, research analyzing data from Fermi revealed through an observation of neutral pion decay that supernovae were indeed a source of cosmic rays, with each explosion producing roughly 3 × 10 – 3 × 10   J of cosmic rays. Supernovae do not produce all cosmic rays, however, and

2440-518: A so-called air shower secondary radiation that rains down, including x-rays , protons, alpha particles, pions, muons, electrons, neutrinos, and neutrons . All of the secondary particles produced by the collision continue onward on paths within about one degree of the primary particle's original path. Typical particles produced in such collisions are neutrons and charged mesons such as positive or negative pions and kaons . Some of these subsequently decay into muons and neutrinos, which are able to reach

2562-470: A source of cosmic rays. Subsequently, Sekido et al. (1951) identified the Crab Nebula as a source of cosmic rays. Since then, a wide variety of potential sources for cosmic rays began to surface, including supernovae , active galactic nuclei, quasars , and gamma-ray bursts . Later experiments have helped to identify the sources of cosmic rays with greater certainty. In 2009, a paper presented at

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2684-439: A specific orbit. To ensure this the payload, such as a warhead or satellite, is designed to withstand certain amounts of various types of "punishment" on the way to its destination. Most rocket payloads are fitted within a payload fairing to protect them against dynamic pressure of high-velocity travel through the atmosphere, and to improve the overall aerodynamics of the launch vehicle. Most aircraft payloads are carried within

2806-488: Is a company that provides air transport services for traveling passengers or freight . Airlines use aircraft to supply these services and may form partnerships or alliances with other airlines for codeshare agreements , in which they both offer and operate the same flight. Generally, airline companies are recognized with an air operating certificate or license issued by a governmental aviation body. Airlines may be scheduled or charter operators. The first airline

2928-453: Is also responsible for the abundances of scandium , titanium , vanadium , and manganese ions in cosmic rays produced by collisions of iron and nickel nuclei with interstellar matter . At high energies the composition changes and heavier nuclei have larger abundances in some energy ranges. Current experiments aim at more accurate measurements of the composition at high energies. Satellite experiments have found evidence of positrons and

3050-407: Is an area of active research. An active search from Earth orbit for anti-alpha particles as of 2019 had found no unequivocal evidence. Upon striking the atmosphere, cosmic rays violently burst atoms into other bits of matter, producing large amounts of pions and muons (produced from the decay of charged pions , which have a short half-life) as well as neutrinos . The neutron composition of

3172-425: Is limited by a combination of the maximum net power of the engines and the lift/drag ratio of the wings. The diagonal line after the range-at-maximum-payload point shows how reducing the payload allows increasing the fuel (and range) when taking off with the maximum take-off weight. The second kink in the curve represents the point at which the maximum fuel capacity is reached. Flying further than that point means that

3294-461: Is more accurate than indirect detection. However the flux of cosmic rays decreases with energy, which hampers direct detection for the energy range above 1 PeV. Both direct and indirect detection are realized by several techniques. Direct detection is possible by all kinds of particle detectors at the ISS , on satellites, or high-altitude balloons. However, there are constraints in weight and size limiting

3416-486: Is similar to the primordial elemental abundance ratio of these elements, 24%. The remaining fraction is made up of the other heavier nuclei that are typical nucleosynthesis end products, primarily lithium , beryllium , and boron . These nuclei appear in cosmic rays in greater abundance (≈1%) than in the solar atmosphere, where they are only about 10 as abundant (by number) as helium . Cosmic rays composed of charged nuclei heavier than helium are called HZE ions . Due to

3538-660: The Auger Project is currently operated at a site on the Pampas of Argentina by an international consortium of physicists. The project was first led by James Cronin , winner of the 1980 Nobel Prize in Physics from the University of Chicago , and Alan Watson of the University of Leeds , and later by scientists of the international Pierre Auger Collaboration. Their aim is to explore the properties and arrival directions of

3660-571: The Farman F.60 Goliath plane flew scheduled services from Toussus-le-Noble to Kenley , near Croydon , England. Another early French airline was the Compagnie des Messageries Aériennes , established in 1919 by Louis-Charles Breguet , offering a mail and freight service between Le Bourget Airport , Paris and Lesquin Airport , Lille . The first German airline to use heavier than air aircraft

3782-695: The Fermi Space Telescope (2013) have been interpreted as evidence that a significant fraction of primary cosmic rays originate from the supernova explosions of stars. Based on observations of neutrinos and gamma rays from blazar TXS 0506+056 in 2018, active galactic nuclei also appear to produce cosmic rays. The term ray (as in optical ray ) seems to have arisen from an initial belief, due to their penetrating power, that cosmic rays were mostly electromagnetic radiation . Nevertheless, following wider recognition of cosmic rays as being various high-energy particles with intrinsic mass ,

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3904-654: The Ford Motor Company bought out the Stout Aircraft Company and began construction of the all-metal Ford Trimotor , which became the first successful American airliner. With a 12-passenger capacity, the Trimotor made passenger service potentially profitable. Air service was seen as a supplement to rail service in the American transportation network. At the same time, Juan Trippe began

4026-634: The International Cosmic Ray Conference by scientists at the Pierre Auger Observatory in Argentina showed ultra-high energy cosmic rays originating from a location in the sky very close to the radio galaxy Centaurus A , although the authors specifically stated that further investigation would be required to confirm Centaurus A as a source of cosmic rays. However, no correlation was found between

4148-639: The International Space Station show that positrons in the cosmic rays arrive with no directionality. In September 2014, new results with almost twice as much data were presented in a talk at CERN and published in Physical Review Letters. A new measurement of positron fraction up to 500 GeV was reported, showing that positron fraction peaks at a maximum of about 16% of total electron+positron events, around an energy of 275 ± 32 GeV . At higher energies, up to 500 GeV,

4270-700: The Tupolev Tu-104 . Deregulation of the European Union airspace in the early 1990s has had substantial effect on the structure of the industry there. The shift towards 'budget' airlines on shorter routes has been significant. Airlines such as EasyJet and Ryanair have often grown at the expense of the traditional national airlines. There has also been a trend for these national airlines themselves to be privatized such as has occurred for Aer Lingus and British Airways . Other national airlines, including Italy's Alitalia , suffered – particularly with

4392-652: The UAL Corporation , along with the AMR Corporation , among a long list of airline holding companies sometime recognized worldwide. Less recognized are the private-equity firms which often seize managerial, financial, and board of directors control of distressed airline companies by temporarily investing large sums of capital in air carriers, to rescheme an airlines assets into a profitable organization or liquidating an air carrier of their profitable and worthwhile routes and business operations. Thus

4514-776: The United States Army Air Service . Private operators were the first to fly the mail but due to numerous accidents the US Army was tasked with mail delivery. During the Army's involvement they proved to be too unreliable and lost their air mail duties. By the mid-1920s, the Postal Service had developed its own air mail network, based on a transcontinental backbone between New York City and San Francisco . To supplement this service, they offered twelve contracts for spur routes to independent bidders. Some of

4636-544: The centrifugal mechanism of acceleration in active galactic nuclei . At 50 joules [J] (3.1 × 10   GeV ), the highest-energy ultra-high-energy cosmic rays (such as the OMG particle recorded in 1991) have energies comparable to the kinetic energy of a 90- kilometre-per-hour [km/h] (56  mph ) baseball. As a result of these discoveries, there has been interest in investigating cosmic rays of even greater energies. Most cosmic rays, however, do not have such extreme energies;

4758-560: The cosmic microwave background (CMB) radiation energy density at ≈0.25 eV/cm . There are two main classes of detection methods. First, the direct detection of the primary cosmic rays in space or at high altitude by balloon-borne instruments. Second, the indirect detection of secondary particle, i.e., extensive air showers at higher energies. While there have been proposals and prototypes for space and balloon-borne detection of air showers, currently operating experiments for high-energy cosmic rays are ground based. Generally direct detection

4880-617: The fuselage for similar reasons. Outsize cargo may require a fuselage with unusual proportions, such as the Super Guppy . The various constraints placed on the launch system can be roughly categorized into those that cause physical damage to the payload and those that can damage its electronic or chemical makeup. Examples of physical damage include extreme accelerations over short time scales caused by atmospheric buffeting or oscillations, extreme accelerations over longer time scales caused by rocket thrust and gravity, and sudden changes in

5002-551: The surface , although the bulk are deflected off into space by the magnetosphere or the heliosphere . Cosmic rays were discovered by Victor Hess in 1912 in balloon experiments, for which he was awarded the 1936 Nobel Prize in Physics . Direct measurement of cosmic rays, especially at lower energies, has been possible since the launch of the first satellites in the late 1950s. Particle detectors similar to those used in nuclear and high-energy physics are used on satellites and space probes for research into cosmic rays. Data from

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5124-564: The 1930s, the U.S. airline industry was generally profitable, even during the Great Depression . This trend continued until the beginning of World War II . World War II, like World War I, brought new life to the airline industry. Many airlines in the Allied countries were flush from lease contracts to the military, and foresaw a future explosive demand for civil air transport, for both passengers and cargo. They were eager to invest in

5246-609: The Atlantic 36 times before crashing at Lakehurst, New Jersey, on 6 May 1937. In 1938, a weekly air service from Berlin to Kabul , Afghanistan , started operating. From February 1934 until World War II began in 1939, Deutsche Lufthansa operated an airmail service from Stuttgart , Germany via Spain , the Canary Islands and West Africa to Natal in Brazil . This was the first time an airline flew across an ocean. By

5368-639: The Netherlands, Jacob Clay found evidence, later confirmed in many experiments, that cosmic ray intensity increases from the tropics to mid-latitudes, which indicated that the primary cosmic rays are deflected by the geomagnetic field and must therefore be charged particles, not photons. In 1929, Bothe and Kolhörster discovered charged cosmic-ray particles that could penetrate 4.1 cm of gold. Charged particles of such high energy could not possibly be produced by photons from Millikan's proposed interstellar fusion process. In 1930, Bruno Rossi predicted

5490-502: The Pierre Auger Observatory is undergoing an upgrade to improve its accuracy and find evidence for the yet unconfirmed origin of the most energetic cosmic rays. High-energy gamma rays (>50   MeV photons) were finally discovered in the primary cosmic radiation by an MIT experiment carried on the OSO-3 satellite in 1967. Components of both galactic and extra-galactic origins were separately identified at intensities much less than 1% of

5612-757: The Rossi Cosmic Ray Group at the Massachusetts Institute of Technology . The experiment employed eleven scintillation detectors arranged within a circle 460 metres in diameter on the grounds of the Agassiz Station of the Harvard College Observatory . From that work, and from many other experiments carried out all over the world, the energy spectrum of the primary cosmic rays is now known to extend beyond 10  eV. A huge air shower experiment called

5734-493: The U.S. passenger market. Although Philippine Airlines (PAL) was officially founded on February 26, 1941, its license to operate as an airliner was derived from merged Philippine Aerial Taxi Company (PATCO) established by mining magnate Emmanuel N. Bachrach on 3 December 1930, making it Asia's oldest scheduled carrier still in operation. Commercial air service commenced three weeks later from Manila to Baguio , making it Asia's first airline route. Bachrach's death in 1937 paved

5856-592: The United States until its closure in 2008. Following World War I , the United States found itself swamped with aviators. Many decided to take their war-surplus aircraft on barnstorming campaigns, performing aerobatic maneuvers to woo crowds. In 1918, the United States Postal Service won the financial backing of Congress to begin experimenting with air mail service, initially using Curtiss Jenny aircraft that had been procured by

5978-458: The airplane has been loaded with its maximum payload that the wings can support, it can still carry a significant amount of fuel. Launch and transport system differ not only on the payload that can be carried but also in the stresses and other factors placed on the payload. The payload must not only be lifted to its target, it must also arrive safely, whether elsewhere on the surface of the Earth or

6100-535: The arrival directions of the highest energy cosmic rays. Since the Galactic Center is in the deficit region, this anisotropy can be interpreted as evidence for the extragalactic origin of cosmic rays at the highest energies. This implies that there must be a transition energy from galactic to extragalactic sources, and there may be different types of cosmic-ray sources contributing to different energy ranges. Cosmic rays can be divided into two types: However,

6222-458: The assumption that radiation of very high penetrating power enters from above into our atmosphere." In 1913–1914, Werner Kolhörster confirmed Victor Hess's earlier results by measuring the increased ionization enthalpy rate at an altitude of 9 km. Hess received the Nobel Prize in Physics in 1936 for his discovery. Bruno Rossi wrote in 1964: In the late 1920s and early 1930s

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6344-467: The average domestic ticket price has dropped by 40%. So has airline employee pay. By incurring massive losses, the airlines of the USA now rely upon a scourge of cyclical Chapter 11 bankruptcy proceedings to continue doing business. America West Airlines (which has since merged with US Airways) remained a significant survivor from this new entrant era, as dozens, even hundreds, have gone under. In many ways,

6466-543: The bare nuclei of common atoms (stripped of their electron shells), and about 1% are solitary electrons (that is, one type of beta particle ). Of the nuclei, about 90% are simple protons (i.e., hydrogen nuclei); 9% are alpha particles , identical to helium nuclei; and 1% are the nuclei of heavier elements, called HZE ions . These fractions vary highly over the energy range of cosmic rays. A very small fraction are stable particles of antimatter , such as positrons or antiprotons . The precise nature of this remaining fraction

6588-499: The biggest winner in the deregulated environment was the air passenger. Although not exclusively attributable to deregulation, indeed the U.S. witnessed an explosive growth in demand for air travel. Many millions who had never or rarely flown before became regular fliers, even joining frequent flyer loyalty programs and receiving free flights and other benefits from their flying. New services and higher frequencies meant that business fliers could fly to another city, do business, and return

6710-406: The carriers that won these routes would, through time and mergers, evolve into Pan Am , Delta Air Lines , Braniff Airways , American Airlines , United Airlines (originally a division of Boeing ), Trans World Airlines , Northwest Airlines , and Eastern Air Lines . Service during the early 1920s was sporadic: most airlines at the time were focused on carrying bags of mail . In 1925, however,

6832-466: The choices of detectors. An example for the direct detection technique is a method based on nuclear tracks developed by Robert Fleischer, P. Buford Price , and Robert M. Walker for use in high-altitude balloons. In this method, sheets of clear plastic, like 0.25  mm Lexan polycarbonate, are stacked together and exposed directly to cosmic rays in space or high altitude. The nuclear charge causes chemical bond breaking or ionization in

6954-483: The country's flagship carrier to this day, on 17 May 1933. Germany's Deutsche Lufthansa was created in 1926 by merger of two airlines, one of them Junkers Luftverkehr . Lufthansa, due to the Junkers heritage and unlike most other airlines at the time, became a major investor in airlines outside of Europe, providing capital to Varig and Avianca. German airliners built by Junkers , Dornier , and Fokker were among

7076-584: The damage they inflict on microelectronics and life outside the protection of an atmosphere and magnetic field, and scientifically, because the energies of the most energetic ultra-high-energy cosmic rays have been observed to approach 3 × 10 eV  (This is slightly greater than 21 million times the design energy of particles accelerated by the Large Hadron Collider , 14 teraelectronvolts [TeV] (1.4 × 10   eV ). ) One can show that such enormous energies might be achieved by means of

7198-467: The domestic industry operates over 10,000 daily departures nationwide. Toward the end of the century, a new style of low cost airline emerged, offering a no-frills product at a lower price. Southwest Airlines , JetBlue , AirTran Airways , Skybus Airlines and other low-cost carriers began to represent a serious challenge to the so-called "legacy airlines", as did their low-cost counterparts in many other countries. Their commercial viability represented

7320-506: The end of the 1930s Aeroflot had become the world's largest airline, employing more than 4,000 pilots and 60,000 other service personnel and operating around 3,000 aircraft (of which 75% were considered obsolete by its own standards). During the Soviet era Aeroflot was synonymous with Russian civil aviation, as it was the only air carrier. It became the first airline in the world to operate sustained regular jet services on 15 September 1956 with

7442-460: The energy distribution of cosmic rays peaks at 300 megaelectronvolts [MeV] (4.8 × 10   J ). After the discovery of radioactivity by Henri Becquerel in 1896, it was generally believed that atmospheric electricity, ionization of the air , was caused only by radiation from radioactive elements in the ground or the radioactive gases or isotopes of radon they produce. Measurements of increasing ionization rates at increasing heights above

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7564-417: The energy of cosmic ray flux in interstellar space is very comparable to that of other deep space energies: cosmic ray energy density averages about one electron-volt per cubic centimetre of interstellar space, or ≈1 eV/cm , which is comparable to the energy density of visible starlight at 0.3 eV/cm , the galactic magnetic field energy density (assumed 3 microgauss) which is ≈0.25 eV/cm , or

7686-403: The fine experiments of Professor Millikan and the even more far-reaching experiments of Professor Regener, we have now got for the first time, a curve of absorption of these radiations in water which we may safely rely upon". In the 1920s, the term cosmic ray was coined by Robert Millikan who made measurements of ionization due to cosmic rays from deep under water to high altitudes and around

7808-618: The first flagships of the Jet Age in the West, while the Eastern bloc had Tupolev Tu-104 and Tupolev Tu-124 in the fleets of state-owned carriers such as Czechoslovak ČSA , Soviet Aeroflot and East-German Interflug . The Vickers Viscount and Lockheed L-188 Electra inaugurated turboprop transport. On 4 October 1958, British Overseas Airways Corporation started transatlantic flights between London Heathrow and New York Idlewild with

7930-435: The flux of cosmic rays at Earth's surface. The following table of participial frequencies reach the planet and are inferred from lower-energy radiation reaching the ground. In the past, it was believed that the cosmic ray flux remained fairly constant over time. However, recent research suggests one-and-a-half- to two-fold millennium-timescale changes in the cosmic ray flux in the past forty thousand years. The magnitude of

8052-413: The globe. Millikan believed that his measurements proved that the primary cosmic rays were gamma rays; i.e., energetic photons. And he proposed a theory that they were produced in interstellar space as by-products of the fusion of hydrogen atoms into the heavier elements, and that secondary electrons were produced in the atmosphere by Compton scattering of gamma rays. In 1927, while sailing from Java to

8174-575: The ground during the decade from 1900 to 1910 could be explained as due to absorption of the ionizing radiation by the intervening air. In 1909, Theodor Wulf developed an electrometer , a device to measure the rate of ion production inside a hermetically sealed container, and used it to show higher levels of radiation at the top of the Eiffel Tower than at its base. However, his paper published in Physikalische Zeitschrift

8296-410: The high charge and heavy nature of HZE ions, their contribution to an astronaut's radiation dose in space is significant even though they are relatively scarce. This abundance difference is a result of the way in which secondary cosmic rays are formed. Carbon and oxygen nuclei collide with interstellar matter to form lithium , beryllium , and boron , an example of cosmic ray spallation . Spallation

8418-619: The incidence of gamma-ray bursts and cosmic rays, causing the authors to set upper limits as low as 3.4 × 10 ×  erg ·cm on the flux of 1 GeV – 1 TeV cosmic rays from gamma-ray bursts. In 2009, supernovae were said to have been "pinned down" as a source of cosmic rays, a discovery made by a group using data from the Very Large Telescope . This analysis, however, was disputed in 2011 with data from PAMELA , which revealed that "spectral shapes of [hydrogen and helium nuclei] are different and cannot be described well by

8540-513: The last 50 years of the airline industry have varied from reasonably profitable, to devastatingly depressed. As the first major market to deregulate the industry in 1978, U.S. airlines have experienced more turbulence than almost any other country or region. In fact, no U.S. legacy carrier survived bankruptcy-free. Among the outspoken critics of deregulation, former CEO of American Airlines, Robert Crandall has publicly stated: "Chapter 11 bankruptcy protection filing shows airline industry deregulation

8662-406: The line shows the constant maximum payload as the range increases. More fuel needs to be added for more range. The vertical line represents the range at which the combined weight of the aircraft, maximum payload and needed fuel reaches the maximum take-off weight (MTOW) of the aircraft. If the range is increased beyond that point, payload has to be sacrificed for fuel. The maximum take-off weight

8784-469: The magnetic field of the solar wind through which cosmic rays propagate to Earth. This results in a modulation of the arriving fluxes at lower energies, as detected indirectly by the globally distributed neutron monitor network. Early speculation on the sources of cosmic rays included a 1934 proposal by Baade and Zwicky suggesting cosmic rays originated from supernovae. A 1948 proposal by Horace W. Babcock suggested that magnetic variable stars could be

8906-423: The magnitude or direction of the acceleration caused by how quick engines are throttled and shut down, etc. Electrical, chemical, or biological payloads can be damaged by extreme temperatures (hot or cold), rapid changes in temperature or pressure, contact with fast moving air streams causing ionization, and radiation exposure from cosmic rays , the van Allen belt , or solar wind . Airline An airline

9028-405: The major airlines implemented an equally high barrier called loss leader pricing. In this strategy an already established and dominant airline stomps out its competition by lowering airfares on specific routes, below the cost of operating on it, choking out any chance a start-up airline may have. The industry side effect is an overall drop in revenue and service quality. Since deregulation in 1978

9150-547: The merger of Instone Air Line Company , British Marine Air Navigation , Daimler Airway and Handley Page Transport , to allow British airlines to compete with stiff competition from French and German airlines that were enjoying heavy government subsidies. The airline was a pioneer in surveying and opening up air routes across the world to serve far-flung parts of the British Empire and to enhance trade and integration. The first new airliner ordered by Imperial Airways,

9272-513: The merger. PAL restarted service on 15 March 1941, with a single Beech Model 18 NPC-54 aircraft, which started its daily services between Manila (from Nielson Field ) and Baguio , later to expand with larger aircraft such as the DC-3 and Vickers Viscount. Cathay Pacific was one of the first airlines to be launched among the other Asian countries in 1946 along with Asiana Airlines , which later joined in 1988. The license to operate as an airliner

9394-462: The mid-1980s. Since the 1980s, there has been a trend of major airline mergers and the formation of airline alliances. The largest alliances are Star Alliance , SkyTeam and Oneworld . Airline alliances coordinate their passenger service programs (such as lounges and frequent-flyer programs ), offer special interline tickets and often engage in extensive codesharing (sometimes systemwide). DELAG , Deutsche Luftschiffahrts-Aktiengesellschaft I

9516-540: The most advanced in the world at the time. In 1926, Alan Cobham surveyed a flight route from the UK to Cape Town , South Africa , following this up with another proving flight to Melbourne , Australia . Other routes to British India and the Far East were also charted and demonstrated at this time. Regular services to Cairo and Basra began in 1927 and were extended to Karachi in 1929. The London- Australia service

9638-657: The newly emerging flagships of air travel such as the Boeing Stratocruiser , Lockheed Constellation , and Douglas DC-6 . Most of these new aircraft were based on American bombers such as the B-29 , which had spearheaded research into new technologies such as pressurization . Most offered increased efficiency from both added speed and greater payload. In the 1950s, the De Havilland Comet , Boeing 707 , Douglas DC-8 , and Sud Aviation Caravelle became

9760-418: The particle cascade increases at lower elevations, reaching between 40% and 80% of the radiation at aircraft altitudes. Of secondary cosmic rays, the charged pions produced by primary cosmic rays in the atmosphere swiftly decay, emitting muons. Unlike pions, these muons do not interact strongly with matter, and can travel through the atmosphere to penetrate even below ground level. The rate of muons arriving at

9882-411: The passenger cabins were often spacious with luxurious interiors – over speed and efficiency. The relatively basic navigational capabilities of pilots at the time also meant that delays due to the weather were commonplace. By the early 1920s, small airlines were struggling to compete, and there was a movement towards increased rationalization and consolidation. In 1924, Imperial Airways was formed from

10004-400: The payload has to be reduced further, for an even lesser increase in range. The absolute range is thus the range at which an aircraft can fly with maximum possible fuel without carrying any payload. Examples of payload capacity: For aircraft, the weight of fuel in wing tanks does not contribute as significantly to the bending moment of the wing as does weight in the fuselage. So even when

10126-400: The payload is one or more warheads and related systems; their total weight is referred to as the throw-weight . The fraction of payload to the total liftoff weight of the air or spacecraft is known as the " payload fraction ". When the weight of the payload and fuel are considered together, it is known as the " useful load fraction ". In spacecraft, "mass fraction" is normally used, which is

10248-414: The plastic. At the top of the plastic stack the ionization is less, due to the high cosmic ray speed. As the cosmic ray speed decreases due to deceleration in the stack, the ionization increases along the path. The resulting plastic sheets are "etched" or slowly dissolved in warm caustic sodium hydroxide solution, that removes the surface material at a slow, known rate. The caustic sodium hydroxide dissolves

10370-479: The primary charged particles. Since then, numerous satellite gamma-ray observatories have mapped the gamma-ray sky. The most recent is the Fermi Observatory, which has produced a map showing a narrow band of gamma ray intensity produced in discrete and diffuse sources in our galaxy, and numerous point-like extra-galactic sources distributed over the celestial sphere. The solar cycle causes variations in

10492-494: The proportion of cosmic rays that they do produce is a question which cannot be answered without deeper investigation. To explain the actual process in supernovae and active galactic nuclei that accelerates the stripped atoms, physicists use shock front acceleration as a plausibility argument (see picture at right). In 2017, the Pierre Auger Collaboration published the observation of a weak anisotropy in

10614-644: The rapid increase of oil prices in early 2008. Finnair , the largest airline of Finland , had no fatal or hull-loss accidents since 1963, and is recognized for its safety. Tony Jannus conducted the United States' first scheduled commercial airline flight on January 1, 1914, for the St. Petersburg-Tampa Airboat Line . The 23-minute flight traveled between St. Petersburg, Florida and Tampa, Florida , passing some 50 feet (15 m) above Tampa Bay in Jannus' Benoist XIV wood and muslin biplane flying boat. His passenger

10736-455: The rate of near-simultaneous discharges of two widely separated Geiger counters was larger than the expected accidental rate. In his report on the experiment, Rossi wrote "... it seems that once in a while the recording equipment is struck by very extensive showers of particles, which causes coincidences between the counters, even placed at large distances from one another." In 1937, Pierre Auger , unaware of Rossi's earlier report, detected

10858-509: The ratio of payload to everything else, including the rocket structure. There is a natural trade-off between the payload and the range of an aircraft. A payload range diagram (also known as the "elbow chart") illustrates the trade-off. The top horizontal line represents the maximum payload. It is limited structurally by maximum zero-fuel weight (MZFW) of the aircraft. Maximum payload is the difference between maximum zero-fuel weight and operational empty weight (OEW). Moving left-to-right along

10980-501: The ratio of positrons to electrons begins to fall again. The absolute flux of positrons also begins to fall before 500 GeV, but peaks at energies far higher than electron energies, which peak about 10 GeV. These results on interpretation have been suggested to be due to positron production in annihilation events of massive dark matter particles. Cosmic ray antiprotons also have a much higher average energy than their normal-matter counterparts (protons). They arrive at Earth with

11102-644: The regional market of Asian airline industry India was also one of the first countries to embrace civil aviation. One of the first Asian airline companies was Air India , which was founded as Tata Airlines in 1932, a division of Tata Sons Ltd. (now Tata Group ). The airline was founded by India's leading industrialist, JRD Tata . On 15 October 1932, J. R. D. Tata himself flew a single engined De Havilland Puss Moth carrying air mail (postal mail of Imperial Airways ) from Karachi to Bombay via Ahmedabad . The aircraft continued to Madras via Bellary piloted by Royal Air Force pilot Nevill Vintcent . Tata Airlines

11224-399: The same day, from almost any point in the country. Air travel's advantages put long-distance intercity railroad travel and bus lines under pressure, with most of the latter having withered away, whilst the former is still protected under nationalization through the continuing existence of Amtrak . By the 1980s, almost half of the total flying in the world took place in the U.S., and today

11346-441: The same phenomenon and investigated it in some detail. He concluded that high-energy primary cosmic-ray particles interact with air nuclei high in the atmosphere, initiating a cascade of secondary interactions that ultimately yield a shower of electrons, and photons that reach ground level. Soviet physicist Sergei Vernov was the first to use radiosondes to perform cosmic ray readings with an instrument carried to high altitude by

11468-440: The secondary radiation produced in the atmosphere is primarily electrons, photons and muons . In 1948, observations with nuclear emulsions carried by balloons to near the top of the atmosphere showed that approximately 10% of the primaries are helium nuclei (alpha particles) and 1% are nuclei of heavier elements such as carbon, iron, and lead. During a test of his equipment for measuring the east–west effect, Rossi observed that

11590-409: The strength of the solar wind is not constant, and hence it has been observed that cosmic ray flux is correlated with solar activity. In addition, the Earth's magnetic field acts to deflect cosmic rays from its surface, giving rise to the observation that the flux is apparently dependent on latitude , longitude , and azimuth angle . The combined effects of all of the factors mentioned contribute to

11712-439: The surface of the Earth is such that about one per second passes through a volume the size of a person's head. Together with natural local radioactivity, these muons are a significant cause of the ground level atmospheric ionisation that first attracted the attention of scientists, leading to the eventual discovery of the primary cosmic rays arriving from beyond our atmosphere. Cosmic rays attract great interest practically, due to

11834-531: The surface of the Earth. Some high-energy muons even penetrate for some distance into shallow mines, and most neutrinos traverse the Earth without further interaction. Others decay into photons, subsequently producing electromagnetic cascades. Hence, next to photons, electrons and positrons usually dominate in air showers. These particles as well as muons can be easily detected by many types of particle detectors, such as cloud chambers , bubble chambers , water-Cherenkov , or scintillation detectors. The observation of

11956-495: The technique of self-recording electroscopes carried by balloons into the highest layers of the atmosphere or sunk to great depths under water was brought to an unprecedented degree of perfection by the German physicist Erich Regener and his group. To these scientists we owe some of the most accurate measurements ever made of cosmic-ray ionization as a function of altitude and depth. Ernest Rutherford stated in 1931 that "thanks to

12078-414: The term "cosmic ray" is often used to refer to only the extrasolar flux. Cosmic rays originate as primary cosmic rays, which are those originally produced in various astrophysical processes. Primary cosmic rays are composed mainly of protons and alpha particles (99%), with a small amount of heavier nuclei (≈1%) and an extremely minute proportion of positrons and antiprotons. Secondary cosmic rays, caused by

12200-437: The term "rays" was still consistent with then known particles such as cathode rays , canal rays , alpha rays , and beta rays . Meanwhile "cosmic" ray photons , which are quanta of electromagnetic radiation (and so have no intrinsic mass) are known by their common names, such as gamma rays or X-rays , depending on their photon energy . Of primary cosmic rays, which originate outside of Earth's atmosphere, about 99% are

12322-503: The upper atmosphere is dependent on the solar wind , the Earth's magnetic field , and the energy of the cosmic rays. At distances of ≈94  AU from the Sun, the solar wind undergoes a transition, called the termination shock , from supersonic to subsonic speeds. The region between the termination shock and the heliopause acts as a barrier to cosmic rays, decreasing the flux at lower energies (≤ 1 GeV) by about 90%. However,

12444-443: The upper atmosphere to produce particles observed at the ground level. Bhabha and Heitler explained the cosmic ray shower formation by the cascade production of gamma rays and positive and negative electron pairs. Measurements of the energy and arrival directions of the ultra-high-energy primary cosmic rays by the techniques of density sampling and fast timing of extensive air showers were first carried out in 1954 by members of

12566-462: The very highest-energy primary cosmic rays. The results are expected to have important implications for particle physics and cosmology, due to a theoretical Greisen–Zatsepin–Kuzmin limit to the energies of cosmic rays from long distances (about 160 million light years) which occurs above 10  eV because of interactions with the remnant photons from the Big Bang origin of the universe. Currently

12688-620: The way for its eventual merger with Philippine Airlines in March 1941 and made it Asia's oldest airline. It is also the oldest airline in Asia still operating under its current name. Bachrach's majority share in PATCO was bought by beer magnate Andres R. Soriano in 1939 upon the advice of General Douglas MacArthur and later merged with newly formed Philippine Airlines with PAL as the surviving entity. Soriano has controlling interest in both airlines before

12810-424: The world. Established by aviator Albert Plesman , it was immediately awarded a "Royal" predicate from Queen Wilhelmina . Its first flight was from Croydon Airport , London to Amsterdam , using a leased Aircraft Transport and Travel DH-16 , and carrying two British journalists and a number of newspapers. In 1921, KLM started scheduled services. In Finland , the charter establishing Aero O/Y (now Finnair )

12932-540: The world. The airline soon gained a reputation for reliability, despite problems with bad weather, and began to attract European competition. In November 1919, it won the first British civil airmail contract. Six Royal Air Force Airco DH.9A aircraft were lent to the company, to operate the airmail service between Hawkinge and Cologne . In 1920, they were returned to the Royal Air Force. Other British competitors were quick to follow – Handley Page Transport

13054-403: Was Aircraft Transport and Travel , formed by George Holt Thomas in 1916; via a series of takeovers and mergers, this company is an ancestor of modern-day British Airways . Using a fleet of former military Airco DH.4 A biplanes that had been modified to carry two passengers in the fuselage , it operated relief flights between Folkestone and Ghent , Belgium. On July 15, 1919, the company flew

13176-525: Was Deutsche Luft-Reederei established in 1917 which started operating in February 1919. In its first year, the D.L.R. operated regularly scheduled flights on routes with a combined length of nearly 1000 miles. By 1921 the D.L.R. network was more than 3000 km (1865 miles) long, and included destinations in the Netherlands, Scandinavia and the Baltic Republics. Another important German airline

13298-455: Was Junkers Luftverkehr , which began operations in 1921. It was a division of the aircraft manufacturer Junkers , which became a separate company in 1924. It operated joint-venture airlines in Austria, Denmark, Estonia, Finland, Hungary, Latvia, Norway, Poland, Sweden and Switzerland. The Dutch airline KLM made its first flight in 1920, and is the oldest continuously operating airline in

13420-525: Was a former mayor of St. Petersburg, who paid $ 400 for the privilege of sitting on a wooden bench in the open cockpit. The Airboat line operated for about four months, carrying more than 1,200 passengers who paid $ 5 each. Chalk's International Airlines began service between Miami and Bimini in the Bahamas in February 1919. Based in Ft. Lauderdale , Chalk's claimed to be the oldest continuously operating airline in

13542-645: Was a mistake." Congress passed the Air Transportation Safety and System Stabilization Act (P.L. 107–42) in response to a severe liquidity crisis facing the already-troubled airline industry in the aftermath of the September 11 attacks . Through the ATSB Congress sought to provide cash infusions to carriers for both the cost of the four-day federal shutdown of the airlines and the incremental losses incurred through December 31, 2001, as

13664-675: Was also one of the world's first major airlines which began its operations without any support from the Government. Cosmic ray Cosmic rays or astroparticles are high-energy particles or clusters of particles (primarily represented by protons or atomic nuclei ) that move through space at nearly the speed of light . They originate from the Sun , from outside of the Solar System in our own galaxy, and from distant galaxies. Upon impact with Earth's atmosphere , cosmic rays produce showers of secondary particles , some of which reach

13786-418: Was established in 1919 and used the company's converted wartime Type O/400 bombers with a capacity for 12 passengers, to run a London - Paris passenger service. The first French airline was Société des lignes Latécoère , later known as Aéropostale, which started its first service in late 1918 to Spain. The Société Générale des Transports Aériens was created in late 1919, by the Farman brothers and

13908-575: Was flown into space aboard the Space Shuttle Discovery on STS-91 in June 1998. By not detecting any antihelium at all, the AMS-01 established an upper limit of 1.1 × 10 for the antihelium to helium flux ratio. When cosmic rays enter the Earth's atmosphere , they collide with atoms and molecules , mainly oxygen and nitrogen. The interaction produces a cascade of lighter particles,

14030-450: Was granted by the federal government body after reviewing the necessity at the national assembly. The Hanjin occupies the largest ownership of Korean Air as well as few low-budget airlines as of now. Korean Air is one of the four founders of SkyTeam , which was established in 2000. Asiana Airlines joined Star Alliance in 2003. Korean Air and Asiana Airlines comprise one of the largest combined airline miles and number of passenger served at

14152-481: Was inaugurated in 1932 with the Handley Page HP 42 airliners. Further services were opened up to Calcutta , Rangoon , Singapore , Brisbane and Hong Kong passengers departed London on 14 March 1936 following the establishment of a branch from Penang to Hong Kong. France began an air mail service to Morocco in 1919 that was bought out in 1927, renamed Aéropostale , and injected with capital to become

14274-467: Was not widely accepted. In 1911, Domenico Pacini observed simultaneous variations of the rate of ionization over a lake, over the sea, and at a depth of 3 metres from the surface. Pacini concluded from the decrease of radioactivity underwater that a certain part of the ionization must be due to sources other than the radioactivity of the Earth. In 1912, Victor Hess carried three enhanced-accuracy Wulf electrometers to an altitude of 5,300 metres in

14396-614: Was signed in the city of Helsinki on 12 September 1923. Junkers F.13 D-335 became the first aircraft of the company, when Aero took delivery of it on 14 March 1924. The first flight was between Helsinki and Tallinn , capital of Estonia , and it took place on 20 March 1924, one week later. In the Soviet Union , the Chief Administration of the Civil Air Fleet was established in 1921. One of its first acts

14518-620: Was the Handley Page W8f City of Washington , delivered on 3 November 1924. In the first year of operation the company carried 11,395 passengers and 212,380 letters. In April 1925, the film The Lost World became the first film to be screened for passengers on a scheduled airliner flight when it was shown on the London-Paris route. Two French airlines also merged to form Air Union on 1 January 1923. This later merged with four other French airlines to become Air France ,

14640-645: Was the world's first airline . It was founded on November 16, 1909, with government assistance, and operated airships manufactured by The Zeppelin Corporation . Its headquarters were in Frankfurt . The first fixed-wing scheduled airline was started on January 1, 1914. The flight was piloted by Tony Jannus and flew from St. Petersburg, Florida , to Tampa, Florida , operated by the St. Petersburg–Tampa Airboat Line . The earliest fixed wing airline in Europe

14762-524: Was the German airship company DELAG , founded on November 16, 1909. The four oldest non-airship airlines that still exist are the Netherlands' KLM (1919), Colombia's Avianca (1919), Australia's Qantas (1920) and the Russian Aeroflot (1923). Airline ownership has seen a shift from mostly personal ownership until the 1930s to government-ownership of major airlines from the 1940s to 1980s and back to large-scale privatization following

14884-404: Was to help found Deutsch-Russische Luftverkehrs A.G. (Deruluft), a German-Russian joint venture to provide air transport from Russia to the West. Domestic air service began around the same time, when Dobrolyot started operations on 15 July 1923 between Moscow and Nizhni Novgorod. Since 1932 all operations had been carried under the name Aeroflot . Early European airlines tended to favor comfort –

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