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Journal Article

Sub‐MeV Electron Precipitation Driven by EMIC Waves in Plasmaspheric Plumes at HighLShells

Authors

Qin,  Murong
External Organizations;

Li,  Wen
External Organizations;

Nishimura,  Yukitoshi
External Organizations;

Huang,  Sheng
External Organizations;

Ma,  Qianli
External Organizations;

/persons/resource/hanzelka

Hanzelka,  M.
1.5 Space Physics and Space Weather, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Capannolo,  Luisa
External Organizations;

Shen,  Xiao‐Chen
External Organizations;

Angelopoulos,  Vassilis
External Organizations;

An,  Xin
External Organizations;

Artemyev,  Anton V.
External Organizations;

Gan,  Longzhi
External Organizations;

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Citation

Qin, M., Li, W., Nishimura, Y., Huang, S., Ma, Q., Hanzelka, M., Capannolo, L., Shen, X., Angelopoulos, V., An, X., Artemyev, A. V., Gan, L. (2025): Sub‐MeV Electron Precipitation Driven by EMIC Waves in Plasmaspheric Plumes at HighLShells. - Journal of Geophysical Research: Space Physics, 130, 3, e2025JA033756.
https://doi.org/10.1029/2025JA033756


Cite as: https://gfzpublic.gfz.de/pubman/item/item_5035409
Abstract
Electromagnetic ion cyclotron (EMIC) waves are known to be efficient for precipitating >1 MeV electrons from the magnetosphere into the upper atmosphere. Despite considerable evidence showing that EMIC-driven electron precipitation can extend down to sub-MeV energies, the precise physical mechanism driving sub-MeV electron precipitation remains an active area of investigation. In this study, we present an electron precipitation event observed by ELFIN CubeSats on 11 January 2022, exclusively at sub-MeV energy at L ∼ 8–10.5, where trapped MeV electrons were nearly absent. The THEMIS satellites observed conjugate H-band and He-band EMIC waves and hiss waves in plasmaspheric plumes near the magnetic equator. Quasi-linear diffusion results demonstrate that the observed He-band EMIC waves, with a high ratio of plasma to electron cyclotron frequency, can drive electron precipitation down to ∼400 keV. Our findings suggest that exclusive sub-MeV precipitation (without concurrent MeV precipitation) can be associated with EMIC waves, especially in the plume region at high L shells.