Washington: In a new research, UCLA researchers have explained the development of the third belt and its decay over a period of slightly more than four weeks.
Since the discovery of the Van Allen radiation belts in the Earth`s upper atmosphere in 1958, space scientists have believed that these belts consisted of two doughnut-shaped rings of highly charged particles - an inner ring of high-energy electrons and energetic positive ions, and an outer ring of high-energy electrons.
However, in February of this year, a team of scientists reported in the journal Science the surprising discovery of a previously unknown third radiation ring. This narrow ring had briefly circled the Earth between the inner and outer rings in September 2012 and then almost completely disappeared.
Now, the group in the UCLA Department of Atmospheric and Oceanic Sciences explained how did this temporary radiation belt appear and dissipate.
By performing a "quantitative treatment of the scattering of relativistic electrons by electromagnetic whistler-mode waves inside the dense plasmasphere," the investigators were able to account for the "distinctively slow decay of the injected relativistic electron flux" and demonstrate why this unusual third radiation belt is observed only at energies above 2 mega-electron-volts.
Understanding the processes that control the formation and ultimate loss of such relativistic electrons is a primary science objective of the NASA Van Allen Probe Mission and has important practical applications, because the enormous amounts of radiation the Van Allen belts generate can pose a significant hazard to satellites and spacecraft, as well to astronauts performing activities outside a spacecraft.
The research is available in the online edition of the journal Geophysical Research Letters and will be published in an upcoming print edition.