James Van Allen

From Wikipedia, the free encyclopedia

James Van Allen at National Air & Space Museum (NASM), 1981, Photo courtesy of NASM. Explorer I model and Pioneer H probe in background
Enlarge
James Van Allen at National Air & Space Museum (NASM), 1981, Photo courtesy of NASM. Explorer I model and Pioneer H probe in background

James Alfred Van Allen (September 7, 1914 – August 9, 2006) was an American space scientist at the University of Iowa. The Van Allen radiation belts were named after him, following the 1958 satellite missions (Explorer I and Explorer III) in which Van Allen had argued that a Geiger counter should be used to detect charged particles.

Contents

[edit] Honors

[edit] Timeline (1914-2006)

To meet Wikipedia's quality standards, this section may require cleanup.
Please discuss this issue on the talk page, and/or replace this tag with a more specific message. Editing help is available.
This section has been tagged since August 2006.

James Van Allen was born in Mount Pleasant, Iowa.

  • 1931

James Van Allen graduated as valedictorian of his Mount Pleasant Public High School class.

  • 1935

Van Allen received his Bachelor of Science degree, summa cum laude, from Iowa Wesleyan College in Mount Pleasant. During his undergraduate years, he studied with Professor Thomas Poulter, a first-class physicist. He tracked meteors, conducted a magnetic survey of Mount Pleasant, and measured cosmic rays at ground level.

  • 1936

Van Allen earned his master’s degree in solid state physics from the University of Iowa.

  • 1939

Van Allen received his Ph.D. in nuclear physics from the University of Iowa. His doctoral research was on measuring the cross-section of the deuteron-deuteron reaction.

  • 1940

As a staff physicist for the Department of Terrestrial Magnetism of the Carnegie Institution in Washington, D.C., Van Allen worked on developing photoelectric and radio proximity fuses for bombs, rockets, and gun-fired projectiles. It was here that Dr. Van Allen acquired his interest in cosmic rays.

  • 1942

Van Allen joined the Applied Physics Laboratory (APL) of Johns Hopkins University to continue his work on proximity fuzes. Later in 1942, he entered the Navy, serving in the South Pacific Fleet as an assistant gunnery officer.

  • 1946

Discharged from the Navy, Van Allen returned to civilian research at APL. He organized and directed a team at John Hopkins University to conduct high-altitude experiments, using V-2 rockets captured from the Germans at the end of World War II, to survey sounding rocket requirements for upper atmosphere research. The V-2 was found to be too heavy and complex for this task. Van Allen decided that what was needed was a small rocket, derived from the Aerojet WAC Corporal and the Bumblebee missile developed under a US Navy program. He drew specifications for this combination of an Aerojet booster and a Bumblebee second stage for this cheaper rocket, dubbed the Aerobee and headed the committee that convinced the U.S. government to produce it. Aerobees were launched from 53 m tall launch towers to provide the necessary stability until the rockets gained enough speed for their fins to be effective in controlling attitude. Launch towers were built at White Sands Missile Range, Fort Churchill, Wallops Island, and aboard the research vessel USN Norton Sound. The Aerobee could take a 68 kg payload to an altitude of 130 km.

Announcement of the concept of the "Rockoon" (as it came to be known). The basic idea, developed by Cmdr. Lee Lewis, Cmdr. G. Halvorson, S. Fred Singer, and James A. Van Allen during an Aerobee firing cruise aboard U.S.S. Norton Sound, is to suspend a small high-performance rocket within a high-altitude balloon. The rocket is fired when the balloon reaches the fringe of the atmosphere, thus rising much higher than it could if launched from the ground.

Van Allen left APL to accept a John Simon Guggenheim Memorial Foundation research fellowship at the Brookhaven National Laboratory. TIME magazine reported in 1959, “In 1950 an event occurred that began small but was to affect the future of Van Allen and all his countrymen. In March, British Physicist Sydney Chapman (astronomer) dropped in on Van Allen [and] remarked that he would like to meet other scientists in the Washington area. Van Allen got on the phone, soon gathered eight or ten top scientists (Lloyd Berkner, S. Fred Singer, and Harry Vestine) in the living room of his small brick house. ‘It was what you might call a pedigreed bull session,’ he says. “The talk turned to geophysics and the two ‘International Polar Years’ that had enlisted the world’s leading nations to study the Arctic and Antarctic regions in 1882 and 1932. Someone suggested that with the development of new tools such as rockets, radar and computers, the time was ripe for a worldwide geophysical year. The other men were enthusiastic, and their enthusiasm spread around the world from Washington DC. From this meeting Lloyd Berkner and other participants proposed to the International Council of Scientific Unions that an IGY be planned for 1957-58 during the maximum solar activity). “The International Geophysical Year (1957-58) stimulated the U.S. Government to promise earth satellites as geophysical tools. The Soviet government countered by rushing its Sputniks into orbit. The race into space or Space Race may be said to have started in Van Allen’s living room that evening in 1950.”

Van Allen with Soviet scientists at 1959 International conference on cosmic radiation.
Enlarge
Van Allen with Soviet scientists at 1959 International conference on cosmic radiation.
  • 1951

James Van Allen became head of the physics department at the University of Iowa. Before long, he was enlisting students in his efforts to discover the secrets of the wild blue yonder and inventing ways to carry instruments higher into the atmosphere than ever before. Van Allen was the first to devise a balloon-rocket combination that lifted rockets on balloons high above most of Earth’s atmosphere before firing them even higher. The rockets were ignited after the balloons reached an altitude of 16 kilometers.

  • 1952

As TIME reported in 1959, “Van Allen’s ‘Rockoons’ could not be fired in Iowa for fear that the spent rockets would strike an Iowan or his house.” So Van Allen convinced the U.S. Coast Guard to let him fire his rockoons from the icebreaker Eastwind that was bound for Greenland. “The first balloon rose properly to 70,000 ft., but the rocket hanging under it did not fire. The second Rockoon behaved in the same maddening way. On the theory that extreme cold at high altitude might have stopped the clockwork supposed to ignite the rockets, Van Allen heated cans of orange juice, snuggled them into the third Rockoon’s gondola, and wrapped the whole business in insulation. The rocket fired.”

  • 1953

Rockoons fired off Newfoundland detect the first hint of radiation belts surrounding Earth. The low-cost Rockoon technique was later used by the Office of Naval Research and The University of Iowa research groups in 1953-55 and 1957, from ships in sea between Boston and Thule, Greenland.

Symposium on "The Scientific Uses of Earth Satellites" held at the University of Michigan under sponsorship of the Upper Atmosphere Rocket Research Panel, James A. Van Allen of The University of Iowa, Chairman.

The Upper Atmosphere Rocket Research Panel was renamed the Rocket and Satellite Research Panel. Its chairman was James A. Van Allen of University of Iowa.

The International Geophysical Year begins. IGY is carried out by the International Council of Scientific Unions, over an 18-month period selected to match the period of maximum solar activity (e.g. sun spots). Lloyd Berkner, one of the scientists at the April 5, 1950 Silver Spring, Maryland meeting in Van Allen's home, serves as president of the ICSU from 1957 to 1959.

Thirty-six Rockoons (balloon-launched rockets) were launched from Navy icebreaker U.S.S. Glacier in Atlantic, Pacific, and Antarctic areas ranging from 75° N. to 72° S. latitude, as part of the U.S. International Geophysical Year scientific program headed by James A. Van Allen and Lawrence J. Cahill of The University of Iowa. These were the first known upper atmosphere rocket soundings in the Antartctic area. Launched from IGY Rockoon Launch Site 2, Atlantic Ocean - Latitude: 0.83° N, Longitude: 0.99° W.

The Soviet Union (USSR) successfully launches Sputnik 1, the world's first artificial satellite, as part of their participation in the IGY.

Pickering, Van Allen & Von Braun at NASA news conference.
Enlarge
Pickering, Van Allen & Von Braun at NASA news conference.

The first American satellite, Explorer 1, was launched into Earth's orbit on a Jupiter C missile from Cape Canaveral, Florida. Aboard Explorer 1 were a micrometeorite detector and a cosmic ray experiment designed by Dr. Van Allen and his graduate students. Data from Explorer 1 and Explorer 3 (launched March 26, 1958) were used by the Iowa group to make the first space-age scientific discovery: the existence of a doughnut-shaped region of charged particle radiation trapped by Earth’s magnetic field.

  • July 1958

United States Congress passed the National Aeronautics and Space Act (commonly called the "Space Act"), which created the National Aeronautics and Space Administration NASA as of October 1, 1958 from the National Advisory Committee for Aeronautics (NACA) and other government agencies.

Van Allen on May 4, 1959 cover of TIME magazine.
Enlarge
Van Allen on May 4, 1959 cover of TIME magazine.

Pioneer 3, the third intended U.S. International Geophysical Year lunar probe under the direction of NASA with the Army acting as executive agent, was launched from the Atlantic Missile Range by a Juno II rocket. The primary objective of the flight, to place the 12.95 pound (5.87 kg) scientific payload in the vicinity of the moon, failed. Pioneer III did reach an altitude of 63,000 miles (101 Mm), providing Van Allen additional data that led to discovery of a second radiation belt. Trapped radiation starts at an altitude of several hundred miles from Earth and extends for several thousand miles into space. The Van Allen radiation belts are named for Dr. James Van Allen, their discoverer.

The International Geophysical Year ends.

TIME magazine writers credited James Van Allen as the man most responsible for giving the U.S. “a big lead in scientific achievement.” They called Van Allen “a key figure in the cold war’s competition for prestige. ...Today he can tip back his head and look at the sky. Beyond its outermost blue are the world-encompassing belts of fierce radiation that bear his name. No human name has ever been given to a more majestic feature of the planet Earth.”

Van Allen on Jan 2, 1961 Men of Year cover TIME magazine.
Enlarge
Van Allen on Jan 2, 1961 Men of Year cover TIME magazine.
  • 1960 and beyond

Since 1960, James Van Allen, his colleagues, associates and students at The University of Iowa have flown scientific instruments on sounding rockets, Earth satellites (Hawkeye 1), and interplanetary spacecraft — including the first missions (Pioneer program, Mariner program, Voyager program, Galileo spacecraft) to the planets Venus, Mars, Jupiter, Saturn, Uranus, and Neptune. Their discoveries have contributed important segments to the world's knowledge of energetic particles, plasmas and radio waves throughout the solar system.

  • 1985

Dr. Van Allen retired from The University of Iowa in 1985, but continued to live in Iowa City and served as the Carver Professor of Physics, Emeritus.

The University of Iowa and the UI Alumni Association hosted a celebration to honor Professor James Van Allen and his many accomplishments, and in recognition of his 90th birthday. Activities included an invited lecture series, a public lecture followed by a cake and punch reception, and an evening banquet.

[edit] Quotations

“Certainly one of the most enthralling things about human life is the recognition that we live in what, for practical purposes, is a universe without bounds.”


“...Outer space, once a region of spirited international competition, is also a region of international cooperation. I realized this as early as 1959, when I attended an international conference on cosmic radiation in Moscow. At this conference, there were many differing views and differing methods of attack, but the problems were common ones to all of us and a unity of basic purpose was everywhere evident.

Many of the papers presented there depended in an essential way upon others which had appeared originally in as many as three or four different languages. Surely science is one of the universal human activities.”

[edit] External links

Retrieved from "http://en.wikipedia.org../../../j/a/m/James_Van_Allen_70c0.html"