Spectra of keV protons related to ion-cyclotron wave packets

TitleSpectra of keV protons related to ion-cyclotron wave packets
Publication TypeJournal Article
Year of Publication2017
AuthorsKhazanov, KGV, Sibeck, DG, Tel'nikhin, AA, Kronberg, TK
JournalPhysics of Plasmas
Date Published01/2017
KeywordsDiffusion; Particle precipitation; protons; Van Allen Probes; wave particle interactions; Wave power
AbstractWe use the Fokker-Planck-Kolmogorov equation to study the statistical aspects of stochastic dynamics of the radiation belt (RB) protons driven by nonlinear electromagnetic ion-cyclotron (EMIC) wave packets. We obtain the spectra of keV protons scattered by these waves that show steeping near the gyroresonance, the signature of resonant wave-particle interaction that cannot be described by a simple power law. The most likely mechanism for proton precipitation events in RBs is shown to be nonlinear wave-particle interaction, namely, the scattering of RB protons into the loss cone by EMIC waves.

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