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

TitlePoloidal mode wave-particle interactions inferred from Van Allen Probes and CARISMA ground-based observations
Publication TypeJournal Article
Year of Publication2018
AuthorsWang, C, Rankin, R, Wang, Y, Zong, Q-G, Zhou, X, Takahashi, K, Marchand, R, Degeling, AW
JournalJournal of Geophysical Research: Space Physics
Date Published05/2018
KeywordsULF wave, drift‐resonant, test particle simulation; Van Allen Probes
AbstractUltra‐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 Alfvén 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° − 40° pitch angle for ion energies between ∼90 − 220keV, and an absence of flux modulations at 90°. 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.
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2017JA025123
DOI10.1029/2017JA025123
Short TitleJ. Geophys. Res. Space Physics


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