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Cold Plasmaspheric Electrons Affected by ULF Waves in the Inner Magnetosphere: A Van Allen Probes Statistical Study
Author(s) -
Ren Jie,
Zong Q. G.,
Zhou X. Z.,
Spence H. E.,
Funsten H. O.,
Wygant J. R.,
Rankin R.
Publication year - 2019
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2019ja027009
Subject(s) - magnetosphere , physics , plasmasphere , van allen probes , earth's magnetic field , geophysics , van allen radiation belt , electron , solar wind , ultra low frequency , computational physics , wave power , hiss , ring current , plasma , power (physics) , magnetic field , astronomy , nuclear physics , quantum mechanics
Six 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 (V S ), but the occurrence rates are increasing with larger AE, |SYMH|, and V S . 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.