Wave-induced loss of ultra-relativistic electrons in the Van Allen radiation belts.

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 Commun

journal_title

Nature communications

authors

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 NA

doi

10.1038/ncomms12883

subject

Has Abstract

pub_date

2016-09-28 00:00:00

pages

12883

issn

2041-1723

pii

ncomms12883

journal_volume

7

pub_type

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