Multipoint Measurement of Fine-Structured EMIC Waves by Arase, Van Allen Probe A, and Ground Stations

S. Matsuda, Y. Miyoshi, Y. Kasahara, L. Blum, C. Colpitts, K. Asamura, Y. Kasaba, A. Matsuoka, F. Tsuchiya, A. Kumamoto, M. Teramoto, S. Nakamura, M. Kitahara, I. Shinohara, G. Reeves, H. Spence, K. Shiokawa, T. Nagatsuma, S. Oyama, I. R. Mann

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We examined the growth and propagation of fine-structured electromagnetic ion cyclotron (EMIC) waves related to time-varying density irregularities using multipoint measurement data observed by Arase, Van Allen Probe A, and two ground-based induction magnetometers (Gakona and Dawson) during a field line conjunction event on April 18, 2019. We analyzed the wave data obtained by the aforementioned spacecraft and stations, and found that the appearance of fine structures in the observed EMIC waves clearly coincided with the ambient electron density irregularities in the magnetosphere, which can cause periodic wave growth and waveguiding on their propagation. Furthermore, we found that the latitudinal widths of the EMIC wave activity region and the wave propagation duct were ∼185 km and less than 80 km at an auroral altitude of 100 km, respectively. We also found thermal ion heating ((Formula presented.) eV/q) during the EMIC wave activity.

Original languageEnglish (US)
Article numbere2021GL096488
JournalGeophysical Research Letters
Volume48
Issue number23
DOIs
StatePublished - Nov 28 2021

Bibliographical note

Funding Information:
The authors wish to acknowledge the EMFISIS and ECT team for providing data. The authors thank D. K. Milling and the rest of the CARISMA team for providing data. CARISMA is operated by the University of Alberta, funded by the Canadian Space Agency. The authors acknowledge the International Space Sciences Institute (ISSI) and the participants in a 2020 ISSI workshop in Bern on “Radiation belt physics from top to bottom.” Part of this work was done at the ERG‐Science Center operated by ISAS/JAXA and ISEE/Nagoya University. This study was supported by Grants‐in‐Aid for Scientific Research (14J02108, 16H06286, 17H06140, 20K14546, and 20H01959) of Japan Society for the Promotion of Science (JSPS). This study was supported by JSPS Bilateral Open Partnership Joint Research Projects (JPJSBP120192504).

Funding Information:
The authors wish to acknowledge the EMFISIS and ECT team for providing data. The authors thank D. K. Milling and the rest of the CARISMA team for providing data. CARISMA is operated by the University of Alberta, funded by the Canadian Space Agency. The authors acknowledge the International Space Sciences Institute (ISSI) and the participants in a 2020 ISSI workshop in Bern on ?Radiation belt physics from top to bottom.? Part of this work was done at the ERG-Science Center operated by ISAS/JAXA and ISEE/Nagoya University. This study was supported by Grants-in-Aid for Scientific Research (14J02108, 16H06286, 17H06140, 20K14546, and 20H01959) of Japan Society for the Promotion of Science (JSPS). This study was supported by JSPS Bilateral Open Partnership Joint Research Projects (JPJSBP120192504).

Publisher Copyright:
© 2021. The Authors.

Keywords

  • Arase
  • CARISMA
  • EMIC waves
  • PWING
  • Van Allen Probes
  • multipoint measurement

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