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December 28, 2019 10:00 am
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/-OuHGE7ezqE/us-tests-ways-to-sweep-space-clean-of-radiation-after-nuclear-attack
US Tests Ways To Sweep Space Clean of Radiation After Nuclear Attack
sciencehabit quotes a report from Science Magazine: The U.S. military thought it had cleared the decks when, on 9 July 1962, it heaved a 1.4-megaton nuclear bomb some 400 kilometers into space: Orbiting satellites were safely out of range of the blast. But in the months that followed the test, called Starfish Prime, satellites began to wink out one by one, including the world's first communications satellite, Telstar. There was an unexpected aftereffect: High-energy electrons, shed by radioactive debris and trapped by Earth's magnetic field, were fritzing out the satellites' electronics and solar panels. Starfish Prime and similar Soviet tests might be dismissed as Cold War misadventures, never to be repeated. After all, what nuclear power would want to pollute space with particles that could take out its own satellites, critical for communication, navigation, and surveillance? But military planners fear North Korea might be an exception: It has nuclear weapons but not a single functioning satellite among the thousands now in orbit. They quietly refer to a surprise orbital blast as a potential "Pearl Harbor of space." And so, without fanfare, defense scientists are trying to devise a cure. Three space experiments -- one now in orbit and two being readied for launch in 2021 -- aim to gather data on how to drain high-energy electrons out of the radiation belts. The process, called radiation belt remediation (RBR), already happens naturally, when radio waves from deep space or from Earth -- our own radio chatter, for example, or emissions from lightning -- knock electrons trapped in Earth's Van Allen radiation belts into the upper atmosphere, where they quickly shed energy, often triggering aurorae.Read more of this story at Slashdot.
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/-OuHGE7ezqE/us-tests-ways-to-sweep-space-clean-of-radiation-after-nuclear-attack
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