Abstract:
:The dipole configuration of the Earth's magnetic field allows for the trapping of highly energetic particles, which form the radiation belts. Although significant advances have been made in understanding the acceleration mechanisms in the radiation belts, the loss processes remain poorly understood. Unique observations on 17 January 2013 provide detailed information throughout the belts on the energy spectrum and pitch angle (angle between the velocity of a particle and the magnetic field) distribution of electrons up to ultra-relativistic energies. Here we show that although relativistic electrons are enhanced, ultra-relativistic electrons become depleted and distributions of particles show very clear telltale signatures of electromagnetic ion cyclotron wave-induced loss. Comparisons between observations and modelling of the evolution of the electron flux and pitch angle show that electromagnetic ion cyclotron waves provide the dominant loss mechanism at ultra-relativistic energies and produce a profound dropout of the ultra-relativistic radiation belt fluxes.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Shprits YY,Drozdov AY,Spasojevic M,Kellerman AC,Usanova ME,Engebretson MJ,Agapitov OV,Zhelavskaya IS,Raita TJ,Spence HE,Baker DN,Zhu H,Aseev NAdoi
10.1038/ncomms12883subject
Has Abstractpub_date
2016-09-28 00:00:00pages
12883issn
2041-1723pii
ncomms12883journal_volume
7pub_type
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