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Fast transport of resonant electrons in phase space due to nonlinear trapping by whistler waves
Author  Artemyev, A.; Vasiliev, A.; Mourenas, D.; Agapitov, O.; Krasnoselskikh, V.; Boscher, D.; Rolland, G.; 
Keywords  particle trapping; Radiation belts; Waveparticle interaction 
Abstract  We present an analytical, simplified formulation accounting for the fast transport of relativistic electrons in phase space due to waveparticle 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 FokkerPlanck equation can be modified to incorporate nonlinear processes of waveparticle 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 quasilinear acceleration for 100 keV electrons. 
Year of Publication  2014 
Journal  Geophysical Research Letters 
Volume  41 
Number of Pages  57275733 
Section  
Date Published  08/2014 
ISBN  
URL  http://doi.wiley.com/10.1002/grl.v41.16 
DOI  10.1002/grl.v41.1610.1002/2014GL061380 