University of Oulu

Miyoshi, Y., Hosokawa, K., Kurita, S. et al. Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae. Sci Rep 11, 13724 (2021).

Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae

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Author: Miyoshi, Y.1; Hosokawa, K.2; Kurita, S.3;
Organizations: 1Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601, Japan
2Graduate School of Communication Engineering and Informatics, University of Electro-Communications, Chofu, 182-8585, Japan
3Research Institute for Sustainable Humanosphere, Kyoto University, Uji, 611-0011, Japan
4National Institute of Polar Research, Tachikawa, 190-8518, Japan
5University of Oulu, Pentti Kaiteran katu 1, Linnanmaa, Oulu, Finland
6The Graduate University for Advanced Studies, SOKENDAI, Hayama, 240-0193, Japan
7Joint Support-Center for Data Science Research, Research Organization of Information and Systems, Tachikawa, 190-8518, Japan
8National Institute of Information and Communications Technology, Tokyo, 184-8795, Japan
9Japan Aerospace Exploration Agency (JAXA), Sagamihara, 252-5210, Japan
10Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
11Space and Earth Observation Centre, Finnish Meteorological Institute, Helsinki, Finland
12Graduate School of Science, University of Tokyo, Tokyo, 113-0033, Japan
13Graduate School of Science, Osaka University, Toyonaka, 560-0043, Japan
14Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, 920-1192, Japan
15Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan
16Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
17Graduate School of Engineering, Kyushu Institute of Technology, Fukuoka, 820-8501, Japan
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.5 MB)
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Language: English
Published: Springer Nature, 2021
Publish Date: 2021-10-06


Pulsating aurorae (PsA) are caused by the intermittent precipitations of magnetospheric electrons (energies of a few keV to a few tens of keV) through wave-particle interactions, thereby depositing most of their energy at altitudes ~ 100 km. However, the maximum energy of precipitated electrons and its impacts on the atmosphere are unknown. Herein, we report unique observations by the European Incoherent Scatter (EISCAT) radar showing electron precipitations ranging from a few hundred keV to a few MeV during a PsA associated with a weak geomagnetic storm. Simultaneously, the Arase spacecraft has observed intense whistler-mode chorus waves at the conjugate location along magnetic field lines. A computer simulation based on the EISCAT observations shows immediate catalytic ozone depletion at the mesospheric altitudes. Since PsA occurs frequently, often in daily basis, and extends its impact over large MLT areas, we anticipate that the PsA possesses a significant forcing to the mesospheric ozone chemistry in high latitudes through high energy electron precipitations. Therefore, the generation of PsA results in the depletion of mesospheric ozone through high-energy electron precipitations caused by whistler-mode chorus waves, which are similar to the well-known effect due to solar energetic protons triggered by solar flares.

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Series: Scientific reports
ISSN: 2045-2322
ISSN-E: 2045-2322
ISSN-L: 2045-2322
Volume: 11
Article number: 13724
DOI: 10.1038/s41598-021-92611-3
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This research was supported by Grants-in-Aid for Scientific Research (grant number 15H05747 to Y.M., K.H., S.K, S.O., S.S., and Y.O., grant number 16H06286 to Y.M., S.O, and I.O., grand number 17H06140, to I.S., and grand number 20H01959 to Y.M., S.S., and S.K.) of the Japan Society for the Promotion of Science (JSPS). The work of A.K was funded by the Tenure Track Project in Radio Science at the Sodankylä Geophysical Observatory/University of Oulu. The work of P.T.V. was supported by the Academy of Finland (project #335555 ICT-SUNVAC).
Academy of Finland Grant Number: 335555
Detailed Information: 335555 (Academy of Finland Funding decision)
Dataset Reference: Supplementary information:
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