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Global Distribution of EMIC Waves and Its Association to Subauroral Proton Precipitation During the 27 May 2017 Storm: Modeling and Multipoint Observations

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1029/2023ja032337· OSTI ID:2406641
 [1];  [2];  [3];  [4];  [4];  [5];  [3];  [3];  [3];  [3];  [6];  [3];  [3];  [7];  [8];  [9];  [9];  [10];  [11];  [12] more »;  [12];  [13] « less
  1. Nagoya Univ. (Japan); Beihang Univ., Beijing (China)
  2. Beihang Univ., Beijing (China); Ministry of Industry and Information Technology (MIIT), Beijing (China). Key Laboratory of Space Environment Monitoring and Information Processing
  3. Nagoya Univ. (Japan)
  4. Beihang Univ., Beijing (China)
  5. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  6. Athabasca Univ., AB (Canada)
  7. Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan)
  8. Osaka Univ., Toyonaka (Japan)
  9. Univ. of Tokyo (Japan)
  10. Kyoto Univ. (Japan)
  11. Polar Environment Data Science Center (ROIS‐DS), Tokyo (Japan); National Institute of Polar Research (NIPR), Tokyo (Japan); Graduate Institute for Advanced Studies (SOKENDAI), Tokyo (Japan)
  12. Tohoku Univ., Sendai (Japan)
  13. Kanazawa Univ. (Japan)
+ Show Author Affiliations
Recent simulation studies using the RAM-SCB model showed that proton precipitation contributes significantly to the total energy flux deposited into the subauroral ionosphere thereby affecting the magnetosphere-ionosphere coupling. Here, in this study, we use the BATS-R-US + RAM-SCB model to understand the evolution of ElectroMagnetic Ion Cyclotron (EMIC) waves in the inner magnetosphere, their correspondence to the proton precipitation into the subauroral ionosphere, and to assess the performance of the model in reproducing the EMIC wave-particle interactions. During the 27 May 2017 storm, Arase and RBSP-A satellites observed typical signatures of EMIC waves in the inner magnetosphere. Within this interval, Defense Meteorological Satellite Program (DMSP) and National Oceanic and Atmospheric Administration (NOAA)/MetOp satellites observed significant proton precipitation in the dusk-midnight sector. Simulation results show that H- and He-band EMIC waves are excited within regions of strong temperature anisotropy near the plasmapause. The simulated growth rates of EMIC waves show a similar trend to that of the EMIC wave power observed by the Arase and RBSP-A satellites, suggesting that the model can reproduce the EMIC wave activity qualitatively. The simulated H-band waves in the dusk sector are stronger than He-band waves possibly due to the presence of excess protons in the boundary conditions obtained from the BATS-R-US code. The precipitating proton fluxes reproduced by the simulation with EMIC waves are found to agree reasonably well with the DMSP and NOAA/MetOp satellite observations. It is suggested that EMIC wave scattering of ring current ions can account for proton precipitation observed by the DMSP and MetOp satellites during the 27 May 2017 storm.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Japan Society for the Promotion of Science (JSPS); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2406641
Report Number(s):
LA-UR--23-33548
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 6 Vol. 129; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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