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2021

Observational evidence of the excitation of magnetosonic waves by an He ion ring distribution

Abstract We report plasma wave observations of equatorial magnetosonic waves at integer harmonics of the local gyrofrequency of doubly-ionized helium (He). The waves were observed by Van Allen Probe A on 08 Feb 2014 when the spacecraft was in the afternoon magnetic local time sector near inside of the plasmasphere. Analysis of the complementary in-situ energetic ion measurements (1-300 keV) reveals the presence of a helium ion ring distribution centered near 30 keV. Theoretical linear growth rate calculations suggest that th ...

Claudepierre, S.; Liu, X.; Chen, L.; Takahashi, K.;

YEAR: 2021     DOI: https://doi.org/10.1029/2021JA029532

magnetosonic waves; ion Bernstein waves; ring distribution; alpha particles; Plasma instability; ring current; Van Allen Probes



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