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Impact of EMIC-Wave Driven Electron Precipitation on the Radiation Belts and the Atmosphere
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SYSNO ASEP 0559270 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Impact of EMIC-Wave Driven Electron Precipitation on the Radiation Belts and the Atmosphere Author(s) Hendry, Aaron (UFA-U) ORCID
Seppälä, A. (NZ)
Rodger, C. J. (NZ)
Clilverd, M. A. (GB)Number of authors 4 Article number e2020JA028671 Source Title Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 126, č. 3 (2021)Number of pages 14 s. Language eng - English Country US - United States Keywords atmospheric modeling ; electron precipitation ; EMIC waves ; particle interactions Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Open access Institutional support UFA-U - RVO:68378289 UT WOS 000636288800033 EID SCOPUS 85103268121 DOI https://doi.org/10.1029/2020JA028671 Annotation In recent years, there has been a growing body of direct experimental evidence demonstrating electromagnetic ion cyclotron (EMIC) waves driving energetic electron precipitation (EEP) at unexpectedly low, sub-MeV energies-as low as only a few hundred keV. EMIC-wave driven scattering at these energies has important ramifications for our understanding of not only radiation belt electron dynamics, but also the importance of EMIC-driven EEP to the chemical balance of the Earth's atmosphere. In this study, we use three experimentally derived EMIC-driven EEP flux spectra to investigate the impact of this precipitation on trapped radiation belt fluxes. In doing so, we resolve an apparent contradiction with earlier results derived from trapped electron flux populations that suggested EMIC waves only caused significant scattering at ultrarelativistic energies. We show that strong sub-MeV EEP measurements are not necessarily mutually exclusive with a strongly relativistic-only trapped flux response, as the sub-MEV peak precipitation is comparatively much smaller than the trapped population at those energies. Using a further six EEP spectra, we also demonstrate that EMIC-driven EEP can generate significant ionization of the Earth's atmosphere above 40 km, leading to the loss of mesospheric ozone. We find poor correlation between EMIC-driven EEP fluxes and geomagnetic activity proxies, such that EMIC-driven EEP is likely to be poorly specified in the forcing factors of modern coupled-climate models. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2023 Electronic address https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JA028671
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