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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: | embargoed |
| Persistent link: | http://urn.fi/urn:nbn:fi-fe201903128683 |
| Language: | English |
| Published: |
American Geophysical Union,
2018
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| Publish Date: | 2019-06-02 |
| Description: |
AbstractPulsating 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. see all
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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. |