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A Statistical Study of Lower Hybrid Waves in the Earth's Magnetosphere by Van Allen Probes
Author(s) -
Liu Xu,
Chen Lunjin,
Ma Qianli
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2021gl093168
Subject(s) - plasmasphere , magnetosphere , physics , earth radius , geophysics , gyroradius , equator , van allen probes , noon , amplitude , van allen radiation belt , wavelength , computational physics , radius , ion , magnetic field , atmospheric sciences , latitude , astronomy , optics , quantum mechanics , computer security , computer science
The lower hybrid (LH) waves are electrostatic emissions near the LH resonant frequency. They propagate perpendicularly with a small wavelength comparable to Larmor radius of thermal particles and can be capable of heating both ions and electrons. In this study, we statistically study the global distribution of LH waves in the inner magnetosphere by using Van Allen Probes observation from 2012 to 2018. We find that (a) LH waves are commonly observed in the inner magnetosphere. Most LH waves are confined near the magnetic equator with typical amplitudes of 0.02–0.2 mV/m and occurrence rates up to 10%. (b) LH waves extend to inner L regions with increasing wave amplitudes as AE* increases. (c) Weak LH waves occur at the nightside inside the plasmapause. Moderate and strong LH waves occur at the nightside and noon inside the plasmapause. As AE* increases, they extend to all magnetic local times inside the plasmapause and dawnside outside the plasmapause.