Fast transport of resonant electrons in phase space due to nonlinear trapping by whistler waves

Author
Keywords
Abstract
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\textquoterights 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 inline image such that η < 5/2, the efficiency of nonlinear acceleration could be more effective than the conventional quasi-linear acceleration for 100 keV electrons.
Year of Publication
2014
Journal
Geophysical Research Letters
Volume
41
Number of Pages
5727-5733
Date Published
08/2014
URL
http://doi.wiley.com/10.1002/grl.v41.16http://doi.wiley.com/10.1002/2014GL061380
DOI
10.1002/grl.v41.1610.1002/2014GL061380