University of Oulu

Kurita, S., Miyoshi, Y., Shiokawa, K., Higashio, N., Mitani, T., Takashima, T., et al. (2018). Rapid loss of relativistic electrons by EMIC waves in the outer radiation belt observed by Arase, Van Allen Probes, and the PWING ground stations. Geophysical Research Letters, 45, 12,720–12,729. https://doi.org/10.1029/2018GL080262

Rapid loss of relativistic electrons by EMIC waves in the outer radiation belt observed by Arase, Van Allen Probes, and the PWING ground stations

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Author: Kurita, S.1; Miyoshi, Y.1; Shiokawa, K.1;
Organizations: 1Insitute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
2Research and Development Directorate, Japan Aerospace Exploration Agency, Sagamihara, Japan
3Institute for Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
4Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
5Space Science Applications Laboratory, The Aerospace Corporation, Los Angeles, CA, USA
6Observatories, Athabasca University, Edmonton, Alberta, Canada
7Ionospheric Research Unit, The University of Oulu, Oulu, Finland
8National Institute of Polar Research, Tachikawa, Japan
9National Institute of Information and Communications Technology, Koganei, Japan
10SHICRA, Siberian Branch of the Russian Academy of Sciences, Yakutsk, Russia
Format: article
Version: published version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe201902225967
Language: English
Published: American Geophysical Union, 2018
Publish Date: 2019-06-13
Description:

Abstract

There has been increasing evidence for pitch angle scattering of relativistic electrons by electromagnetic ion cyclotron (EMIC) waves. Theoretical studies have predicted that the loss time scale of MeV electrons by EMIC waves can be very fast, suggesting that MeV electron fluxes rapidly decrease in association with the EMIC wave activity. This study reports on a unique event of MeV electron loss induced by EMIC waves based on Arase, Van Allen Probes, and ground‐based network observations. Arase observed a signature of MeV electron loss by EMIC waves, and the satellite and ground‐based observations constrained spatial‐temporal variations of the EMIC wave activity during the loss event. Multisatellite observation of MeV electron fluxes showed that ~2.5‐MeV electron fluxes substantially decreased within a few tens of minutes where the EMIC waves were present. The present study provides an observational estimate of the loss time scale of MeV electrons by EMIC waves.

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Series: Geophysical research letters
ISSN: 0094-8276
ISSN-E: 1944-8007
ISSN-L: 0094-8276
Volume: 45
Issue: 23
Pages: 12,720 - 12,729
DOI: 10.1029/2018GL080262
OADOI: https://oadoi.org/10.1029/2018GL080262
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: This study has been supported by JSPS Grant‐in‐Aid for Scientific Research (15H05815, 15H05747, 16H06286, and 17H06140). This study has also been supported by JSPS Bilateral Open Partnership Joint Research Projects, and the Ministry of Science and Higher Education of the Russian Federation and the Siberian Branch of the Russian Academy of Sciences (project II.16.2.1, registration number AAAA‐A17‐117021450059‐3) and is partially funded by Russian Foundation for Basic Research (18‐45‐140037; D. B.). Observations made at Athabasca were facilitated by Canada Foundation for Innovation support for observatories there. Work at The Aerospace Corporation was supported by RBSP‐ECT funding provided by JHU/APL contract 967399 under NASA's Prime contract NAS5‐01072.
Copyright information: © 2018. American Geophysical Union. All Rights Reserved.