Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 16, Pages 5727-5733Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL061380
Keywords
radiation belts; wave-particle interaction; particle trapping
Categories
Funding
- CNES
- RFBR [13-01-00251]
- [MK-1781.2014.2]
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We present an analytical, simplified formulation accounting for the fast transport of relativistic electrons in phase space due to wave-particle resonant interactions in the inhomogeneous magnetic field of Earth's radiation belts. We show that the usual description of the evolution of the particle velocity distribution based on the Fokker-Planck equation can be modified to incorporate nonlinear processes of wave-particle interaction, including particle trapping. Such a modification consists in one additional operator describing fast particle jumps in phase space. The proposed, general approach is used to describe the acceleration of relativistic electrons by oblique whistler waves in the radiation belts. We demonstrate that for a wave power distribution with a hard enough power law tail P(B-w(2)) alpha B-w(-eta) such that eta < 5/2, the efficiency of nonlinear acceleration could be more effective than the conventional quasi-linear acceleration for 100 keV electrons.
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