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Relativistic electron scattering by magnetosonic waves: Effects of discrete wave emission and high wave amplitudes
Author  Artemyev, A.; Mourenas, D.; Agapitov, O.; Krasnoselskikh, V.; 
Keywords  chorus waves; CLUSTER SPACECRAFT; equatorial noise; MAGNETICFIELD; PLASMA; Quasilinear diffusion; radiation belt electrons; RESONANT SCATTERING; Van Allen Probes; WHISTLERMODE WAVES 
Abstract  In this paper, we study relativistic electron scattering by fast magnetosonic waves. We compare results of test particle simulations and the quasilinear theory for different spectra of waves to investigate how a fine structure of the wave emission can influence electron resonant scattering. We show that for a realistically wide distribution of wave normal angles theta (i.e., when the dispersion delta theta >= 0.5 degrees), relativistic electron scattering is similar for a wide wave spectrum and for a spectrum consisting in wellseparated ion cyclotron harmonics. Comparisons of test particle simulations with quasilinear theory show that for delta theta > 0.5 degrees, the quasilinear approximation describes resonant scattering correctly for a large enough plasma frequency. For a very narrow h distribution (when delta theta >= 0.05 degrees), however, the effect of a fine structure in the wave spectrum becomes important. In this case, quasilinear theory clearly fails in describing accurately electron scattering by fast magnetosonic waves. We also study the effect of high wave amplitudes on relativistic electron scattering. For typical conditions in the earth\textquoterights radiation belts, the quasilinear approximation cannot accurately describe electron scattering for waves with averaged amplitudes > 300 pT. We discuss various applications of the obtained results for modeling electron dynamics in the radiation belts and in the Earth\textquoterights magnetotail. (C) 2015 AIP Publishing LLC. 
Year of Publication  2015 
Journal  Physics of Plasmas 
Volume  22 
Number of Pages  062901 
Section  
Date Published  06/2015 
ISBN  
URL  http://scitation.aip.org/content/aip/journal/pop/22/6/10.1063/1.4922061 
DOI  10.1063/1.4922061 