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Simultaneous observations and combined effects of electromagnetic ion cyclotron waves and magnetosonic waves


AuthorTeng, S.; Ma, Q.; Tao, X.;
KeywordsEMIC waves; MS waves; Wave-particle interaction; diffusion coefficients; Van Allen Probes
AbstractAbstract Magnetosonic (MS) waves and Electromagnetic ion cyclotron (EMIC) waves are important plasma waves in the magnetosphere. Using the Van Allen Probes observations from 2012 to 2017, we constructed the global distribution of simultaneous occurrence of MS and EMIC waves. We found a total of 214 events, and the waves distribute from the noon sector to the duskside. Furthermore, we quantitatively analyze the combined effects of both waves on protons and electrons by calculating of particle diffusion coefficients and 2-D Fokker-Planck diffusion simulations. The simulation results show the combined effects of MS and EMIC waves. High-frequency EMIC waves and intense MS waves at low proton harmonics are essential for the enhanced proton acceleration at several hundred eV and enhanced electron loss at several MeV. Our results provide new sights into understanding the distribution of MS and EMIC waves and evaluating their combined effects on the evolution of energetic particles.
Year of Publication2021
JournalGeophysical Research Letters
Volumen/a
Number of Pagese2021GL093885
Section
Date Published08/2021
ISBN
URLhttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021GL093885
DOIhttps://doi.org/10.1029/2021GL093885