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Fukizawa, M., Sakanoi, T., Miyoshi, Y., Hosokawa, K., Shiokawa, K., Katoh, Y., et al. (2018). Electrostatic electron cyclotron harmonic waves as a candidate to cause pulsating auroras. Geophysical Research Letters, 45, 12,661–12,668. https://doi.org/10.1029/2018GL080145

Electrostatic electron cyclotron harmonic waves as a candidate to cause pulsating auroras

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Author: Fukizawa, M.1; Sakanoi, T.1; Miyoshi, Y.2;
Organizations: 1Graduate School of Science, Tohoku University, Sendai, Japan
2Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
3Graduate School of Informatics and Engineering, University of Electro-Communications, Chofu, Japan
4Academia Sinica Institute of Astronomy and Astrophysics, Taipei, Taiwan
5Korea Astronomy and Space Science Institute, Daejeon, South Korea
6National Institute of Polar Research, Tachikawa, Japan
7Polar Environment Data Science Center, Joint Support-Center for Data Science Research, Research Organization of Information and Systems, Tachikawa, Japan
8The Graduate University for Advanced Studies (SOKENDAI), Hayama-machi Miura-gun, Japan
9Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Japan,
10Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
11Ionospheric Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.4 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe201903128683
Language: English
Published: American Geophysical Union, 2018
Publish Date: 2019-06-02
Description:

Abstract

Pulsating auroras (PsAs) are thought to be generated by precipitating electrons scattered by lower‐band chorus (LBC) waves near the magnetic equator. One‐to‐one correlation between the LBC intensity and the PsA intensity has been reported. Electrostatic electron cyclotron harmonic (ECH) waves can also scatter electrons. However, direct correlation between ECH and PsA has not been reported yet. In this study, using a coordinated Exploration of energization and Radiation in Geospace (Arase) satellite and ground‐based imager observation, we report that not only LBC but also ECH have correlation with PsA. We estimated the precipitating electron energy by assuming that the time lag when the cross‐correlation coefficient became the highest was travel time of electrons from the modulation region. We found that the estimated energies show reasonable values as the cyclotron resonance energy of each wave.

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Series: Geophysical research letters
ISSN: 0094-8276
ISSN-E: 1944-8007
ISSN-L: 0094-8276
Volume: 45
Issue: 23
Pages: 12,661 - 12,668
DOI: 10.1029/2018GL080145
OADOI: https://oadoi.org/10.1029/2018GL080145
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: This work has been supported by Japan Society for the Promotion of Science (JSPS) JP 14J02108, 15H05815, JP 15H05747, JP 16H06286, 17K05668, and JP 18H03727. The operation of the EMCCD camera at Sodankylä has been supported by Sodankylä Geophysical Observatory (SGO), University of Oulu.
Copyright information: © 2018. American Geophysical Union. All Rights Reserved.