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

TitleFast transport of resonant electrons in phase space due to nonlinear trapping by whistler waves
Publication TypeJournal Article
Year of Publication2014
AuthorsArtemyev, AV, Vasiliev, AA, Mourenas, D, Agapitov, OV, Krasnoselskikh, V, Boscher, D, Rolland, G
JournalGeophysical Research Letters
Volume41
Issue16
Pagination5727 - 5733
Date Published08/2014
Keywordsparticle trapping; Radiation belts; wave-particle interaction
AbstractWe 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 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.
URLhttp://doi.wiley.com/10.1002/grl.v41.16http://doi.wiley.com/10.1002/2014GL061380
DOI10.1002/grl.v41.1610.1002/2014GL061380
Short TitleGeophys. Res. Lett.


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