Impact of EMIC-Wave Driven Electron Precipitation on the Radiation Belts and the Atmosphere
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F21%3A00559270" target="_blank" >RIV/68378289:_____/21:00559270 - isvavai.cz</a>
Result on the web
<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JA028671" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JA028671</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2020JA028671" target="_blank" >10.1029/2020JA028671</a>
Alternative languages
Result language
angličtina
Original language name
Impact of EMIC-Wave Driven Electron Precipitation on the Radiation Belts and the Atmosphere
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Geophysical Research-Space Physics
ISSN
2169-9380
e-ISSN
2169-9402
Volume of the periodical
126
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
14
Pages from-to
e2020JA028671
UT code for WoS article
000636288800033
EID of the result in the Scopus database
2-s2.0-85103268121