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Observation and Numerical Simulation of Cold Ions Energized by EMIC Waves

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1029/2023ja032361· OSTI ID:2352455
 [1];  [2];  [3];  [1];  [2];  [2];  [4];  [5];  [6];  [7];  [7];  [8];  [9];  [10];  [11];  [2];  [11];  [12];  [12]
  1. Kyung Hee Univ., Seoul (Korea, Republic of)
  2. Nagoya Univ. (Japan)
  3. Korea Polar Research Institute, Incheon (Korea, Republic of)
  4. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Andrews University, Berrien Springs MI (United States)
  5. Chungnam National Univ., Daejeon (Korea, Republic of)
  6. Korea Astronomy and Space Science Institute (KASI), Daejeon (Korea, Republic of)
  7. Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan)
  8. Kyoto Univ. (Japan)
  9. Osaka Univ. (Japan)
  10. Kanazawa Univ. (Japan)
  11. Univ. of Tokyo (Japan)
  12. Tohoku Univ., Sendai (Japan)
+ Show Author Affiliations
This is the first report of significant energization (up to 7,000 eV) of low-energy He+ ions, which occurred simultaneously with H-band electromagnetic ion cyclotron (EMIC) wave activity, in a direction mostly perpendicular to the ambient magnetic field. The event was detected by the Arase satellite in the dayside plasmatrough region off the magnetic equator on 15 May 2019. The peak energy of the He+ flux enhancements is mostly above 1,000 eV. At some interval, the He+ ions are energized up to ~7,000 eV. The H-band waves are excited in a frequency band between the local crossover and helium gyrofrequencies and are close to a linear polarization state with weakly left-handed or right-handed polarization. The normal angle of the waves exhibits significant variation between 0° and 80°, indicating a non-parallel propagation. Here, we run a hybrid code with parameters estimated from the Arase observations to examine the He+ energization. The simulations show that cold He+ ions are energized up to more than 1,000 eV, similar to the spacecraft observations. From the analysis of the simulated wave fields and cold plasma motions, we found that the ratio of the wave frequency to He+ gyrofrequency is a primary factor for transverse energization of cold He+ ions. As a consequence of the numerical analysis, we suggest that the significant transverse energization of He+ ions observed by Arase is attributed to H-band EMIC waves excited near the local helium gyrofrequency.
Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
Korea Polar Research Institute (KOPRI); National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC02-09CH11466
OSTI ID:
2352455
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 5 Vol. 129; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Dataset for "Observation and Numerical Simulation of Cold Ions Energized by EMIC Waves" dataset January 2023
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