Cold Plasmaspheric Electrons Affected by ULF Waves in the Inner Magnetosphere: A Van Allen Probes Statistical Study

TitleCold Plasmaspheric Electrons Affected by ULF Waves in the Inner Magnetosphere: A Van Allen Probes Statistical Study
Publication TypeJournal Article
Year of Publication2019
AuthorsRen, J, Zong, QG, Zhou, XZ, Spence, HE, Funsten, HO, Wygant, JR, Rankin, R
JournalJournal of Geophysical Research: Space Physics
Volume124
Issue10
Pagination7954 - 7965
Date Published10/2019
ISSN2169-9380
KeywordsCold plasmaspheric electrons; drift‐bounce resonance; ULF waves; Van Allen Probes; Wave‐particle interaction
AbstractSix years of Van Allen Probes data are used to investigate cold plasmaspheric electrons affected by ultralow‐frequency (ULF) waves in the inner magnetosphere (L<7) including spatial distributions, occurrence conditions, and resonant energy range. Events exhibit a global distribution within L= 4–7 but preferentially occur at L∼5.5–7 in the dayside, while there is higher occurrence rate in the duskside than dawnside. They can occur under different geomagnetic activities and solar wind velocities (VS), but the occurrence rates are increasing with larger AE, |SYMH|, and VS. These features are closely associated with the generation and propagation of ULF waves in Pc4 (45–150 s) and Pc5 (150–600 s) bands. Combined with electron observations from HOPE instrument, the resonant energies inferred from wave power indicate that cold electrons at ones to hundreds of electron volts can be affected by ULF waves. This study may shed new light on further investigations on the acceleration and transportation of cold plasmaspheric particles that would affect plasmaspheric material release to the Earth's magnetosphere and instabilities for exciting various waves.
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JA027009
DOI10.1029/2019JA027009
Short TitleJ. Geophys. Res. Space Physics


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