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Planetary News: Earth (2007)Balloon Flotilla will Study Earth's Van Allen BeltsDecember 8, 2007
A new NASA project will use more than 40 high altitude balloons to return new scientific insights about Earth's Van Allen Belts. The type of radiation in the belts can be hazardous to astronauts, orbiting satellites and aircraft flying in high altitude polar routes. The new mission is called the Balloon Array for Radiation-belt Relativistic Electron Losses, or BARREL, and its principal investigator is Robyn Millan of Dartmouth. BARREL will fly in 2013 and 2014, and will provide answers to how and where the Van Allen Belts periodically drain into Earth's upper atmosphere. BARREL will fly in conjunction with NASA's Radiation Belt Storm Probes satellites, due to launch in 2011. "The study of near-Earth radiation is very important," said John Mather, Nobel Prize recipient and chief scientist of NASA's Science Mission Directorate. "This research will provide information to mitigate problems here on our planet as well as permit better design and operations of new technology in space and safer passage for space explorers." The Van Allen Belts were first detected in 1958 by the United States' first satellite, Explorer 1, in an experiment directed by James Van Allen of the University of Iowa. The belts are a ring of energetic charged particles that encircle Earth and are constrained by Earth's magnetic field. Outbursts from the sun can pump additional energy and particles into the radiation belts, allowing them to drain again in a matter of days or weeks. The balloons will be launched from Antarctica, and will expand to roughly the size of a large blimp when they reach the near-space research altitude. Each balloon of this type will hover at an altitude of approximately 21 miles for as long as two weeks. By carefully timing the launch of a series of balloons, about one per day, Millan and her group of young scientists in training can form a ring of balloons encircling the South Pole to study the total influx of radiation from the belts into Earth's atmosphere. "This experiment will be the first of its kind in establishing a web of balloon-borne sensors working hand-in-hand with a satellite mission," said Dick Fisher, director of NASA's Heliophysics Division, Washington. "In addition to the groundbreaking science that BARREL will provide, this kind of use of NASA's suborbital program is vital for training the next generation of scientists in a wide range of areas."
In addition to investigating the Earth, balloons have been proposed over the years as an ideal means to study the atmospheres of other bodies in the Solar System. In 1984 the Soviet Vega 1 probe released a balloon in the atmosphere of Venus, which collected valuable information for 47 hours before heating up and exploding. Balloons have also been proposed in recent years to study the atmospheres of Saturn's moon Titan and of Mars. In fact The Planetary Society took a leading part in the development of a Mars Balloon in the 1980's , which was part of a French experiment on the Russian Mars 94 mission. Unfortunately that spacecraft never reached the Red Planet. The Radiation Belt Storm Probes satellites are part of NASA's Living with a Star Program that is designed to understand how and why the sun varies, how planetary systems respond and how human activities are affected. NASA's Goddard Space Flight Center, Greenbelt, Maryland, manages the program for the Science Mission Directorate. |
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