Title: Effects of EMIC Wave-Driven Proton Precipitation on the Ionosphere

Journal Article · · Journal of Geophysical Research. Space Physics
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  1. Beihang Univ., Beijing (China); Ministry of Industry and Information Technology, Beijing (China)
  2. Beihang Univ., Beijing (China)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
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In this report we investigate the proton precipitation caused by electromagnetic ion cyclotron (EMIC) waves and its impact on the ionosphere with the self-consistent ring current-atmosphere interactions model (RAM-SCBE) coupled with an ionospheric particle transport model Global Airglow (GLOW). The EMIC wave diffusion process causes significant precipitation of tens of keV protons, particularly in the afternoon to midnight sector. These precipitating energetic protons further impact the ionosphere-thermosphere and contribute to the ionization in the E/F regions. The integrated auroral conductance is significantly enhanced in the dusk-to-midnight sector. Although the EMIC waves do not directly interact with the ring current electrons, after the EMIC wave scattering included in the model, remarkable changes are found in the global distribution of precipitating electron flux. This means that the addition of proton precipitation driven by EMIC waves results in feedback effects on the ring current electron dynamics through the circulation system. Validation is also conducted by comparing the simulated precipitation flux and ionospheric electron density with observations.

Research Organization:
); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
Sponsoring Organization:
Canadian Space Agency; National Natural Science Foundation of China; National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1865034
Report Number(s):
LA-UR-21-31003
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 2 Vol. 127; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Heliospheric and Magnetospheric Physics