Unusual Stable Trapping of the Ultra-Relativistic Electrons in the Van Allen Radiation Belts

Shprits, Y.Y.; Subbotin, D.; Drozdov, A.; Usanova, M.E.; Kellerman, A.; Orlova, K.; Baker, D.N.; Turner, D.L.; K-C, K.

Авторы: Shprits Y.Y., Subbotin D., Drozdov A., Usanova M.E., Kellerman A., Orlova K., Baker D.N., Turner D.L., K-C Kim
Журнал: Nature Physics
Год издания: 2013
Издательство: Nature Publishing Group
Местоположение издательства: United Kingdom
DOI: 10.1038/nphys2760
Аннотация: Radiation in space was the first discovery of the space age. Earth's radiation belts consist of energetic particles that encircle the planet, which are trapped by the geomagnetic field and encircle the planet. The electron radiation belts usually form a two-zone structure with a stable inner zone and a highly variable outer zone, which forms and disappears due to wave-particle interactions on the time-scale of a day and is strongly influenced by the Very Low Frequency (VLF) plasma waves. Recent observations showed an event, where three radiation zones were observed at ultra-relativistic energies, with the additional medium narrow belt (long-lived ring) that persisted for approximately 4 weeks. This new ring resulted from a combination of electron losses to the interplanetary medium and scattering by Electromagnetic Ion Cyclotron waves to the Earth's atmosphere. It is shown that ultra-relativistic electrons can stay trapped in the outer zone and remain unaffected by the VLF plasma waves for a very long time due to the lack of scattering into the atmosphere. The lack of scattering is explained as a result of ultra-relativistic particles being too energetic to resonantly interact with waves at low latitudes. This study shows that a completely different set of physical processes determines the evolution of ultra-relativistic electrons above 2 MeV as resonant scattering by VLF waves becomes inefficient.
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Unusual Stable Trapping of the Ultra-Relativistic Electrons in the Van Allen Radiation Beltsстатья

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