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2018

Poloidal mode wave-particle interactions inferred from Van Allen Probes and CARISMA ground-based observations

Ultra-low-frequency (ULF) wave and test particle models are used to investigate the pitch angle and energy dependence of ion differential fluxes measured by the Van Allen Probes spacecraft on October 6th, 2012. Analysis of the satellite data reveals modulations in differential flux resulting from drift resonance between H+ ions and fundamental mode poloidal Alfv\ en waves detected near the magnetic equator at L\~5.7. Results obtained from simulations reproduce important features of the observations, including a substantial enhancement of the differential flux between \~20\textdegree - 40\textdegree pitch angle for ion energies between \~90 - 220keV, and an absence of flux modulations at 90\textdegree. The numerical results confirm predictions of drift-bounce resonance theory and show good quantitative agreement with observations of modulations in differential flux produced by ULF waves.

Wang, C.; Rankin, R.; Wang, Y.; Zong, Q.-G.; Zhou, X.; Takahashi, K.; Marchand, R.; Degeling, A.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 05/2018

YEAR: 2018     DOI: 10.1029/2017JA025123

ULF wave; drift-resonant; test particle simulation; Van Allen Probes



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