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2021 
Whistlermode waves trapped by density irregularities in the Earth s magnetosphere Abstract Whistlermode waves are electromagnetic waves pervasively observed in the Earth s and other planetary magnetospheres. They are considered to be mainly responsible for producing the hazardous radiation and diffuse aurora, which heavily relies on their properties. Density irregularities, frequently observed in the Earth s magnetospheres, are found to change largely the properties of whistlermode waves. Here we report, using Van Allen Probes measurements, whistlermode waves strongly modulated by two different density enhancements. With particleincell simulations, we propose wave trapping caused by fieldaligned density irregularities (ducts) may account for this phenomenon. Simulation results show that whistlermode waves can be trapped inside the enhanced density ducts. These trapped waves remain quasiparallel and usually get much larger amplitudes than those unducted whistler waves during propagation away from the magnetic equator, and tend to focus at a spatially narrow channel, consistent with observations. Our results imply density irregularities may be significant to modulate radiationbelt electrons. This article is protected by copyright. All rights reserved. Ke, Yangguang; Chen, Lunjin; Gao, Xinliang; Lu, Quanming; Wang, Xueyi; Chen, Rui; Chen, Huayue; Wang, Shui; Published by: Geophysical Research Letters Published on: 03/2021 YEAR: 2021 DOI: https://doi.org/10.1029/2020GL092305 WHISTLERMODE WAVES; density irregularities; Magnetosphere; Radiation belts; particleincell simulation; Wave trapping; Van Allen Probes 
2017 
Contemporaneous EMIC and WhistlerMode Waves: Observations and Consequences for MeV Electron Loss The high variability of relativistic (MeV) electron fluxes in the Earth\textquoterights radiation belts is partly controlled by loss processes involving resonant interactions with electromagnetic ion cyclotron (EMIC) and whistlermode waves. But as previous statistical models were generated independently for each wave mode, whether simultaneous electron scattering by the two wave types has global importance remains an open question. Using >3 years of simultaneous Van Allen Probes and THEMIS measurements, we explore the contemporaneous presence of EMIC and whistlermode waves in the same Lshell, albeit at different local times, determining the distribution of wave and plasma parameters as a function of L, Kp, and AE. We derive electron lifetimes from observations and provide the first statistics of combined effects of EMIC and whistlermode wave scattering on MeV electrons as a function of L and geomagnetic activity. We show that MeV electron lifetimes are often strongly reduced by such combined scattering. Zhang, X.J.; Mourenas, D.; Artemyev, A.; Angelopoulos, V.; Thorne, R.; Published by: Geophysical Research Letters Published on: 07/2017 YEAR: 2017 DOI: 10.1002/2017GL073886 electron lifetime; EMIC waves; Rediation belts; relativistic electron loss; Van Allen Probes; wave particle interaction; WHISTLERMODE WAVES 
2015 
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. Artemyev, A.; Mourenas, D.; Agapitov, O.; Krasnoselskikh, V.; Published by: Physics of Plasmas Published on: 06/2015 YEAR: 2015 DOI: 10.1063/1.4922061 chorus waves; CLUSTER SPACECRAFT; equatorial noise; MAGNETICFIELD; PLASMA; Quasilinear diffusion; radiation belt electrons; RESONANT SCATTERING; Van Allen Probes; WHISTLERMODE WAVES 
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