University of Oulu

Thomas, N., Kero, A., Miyoshi, Y., Shiokawa, K., Hyötylä, M., Raita, T., et al. (2022). Statistical survey of Arase satellite data sets in conjunction with the Finnish riometer network. Journal of Geophysical Research: Space Physics, 127, e2022JA030271.

Statistical survey of Arase satellite data sets in conjunction with the Finnish riometer network

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Author: Thomas, Neethal1; Kero, Antti1; Miyoshi, Yoshizumi2;
Organizations: 1Sodankylä Geophysical Observatory, University of Oulu, Oulu, Finland
2Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
3Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Japan
4Institute of Space and Astronautical Science/Japan Aerospace Exploration Agency, Sagamihara, Japan
5Department of Earth and Planetary Science, The University of Tokyo, Tokyo, Japan
6Graduate School of Science, Osaka University, Osaka, Japan
7Academia Sinica Institute of Astronomy and Astrophysics, Taipei, Taiwan
8Research and Development Directorate, Japan Aerospace Exploration Agency, Tsukuba, Japan
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.3 MB)
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Language: English
Published: American Geophysical Union, 2022
Publish Date: 2022-07-01


During disturbed geomagnetic conditions, the energetic particles in the inner magnetosphere are known to undergo precipitation loss due to interaction with various plasma waves. This study, investigates the energetic particle precipitation events statistically using coordinate observations from the ground riometer network and the inner-magnetospheric satellite mission, Arase. We have compared cosmic noise absorption (CNA) data obtained from the Finnish ground riometer network located in the auroral/sub-auroral latitudes with the comprehensive data set of omnidirectional electron/proton flux and plasma waves in ELF/VLF frequency range from the Arase satellite during the overpass intervals. The study period includes one and a half years of data between March 2017 and September 2018 covering Arase conjunctions with the riometer stations from all magnetic local time sectors. The relation between the plasma flux/waves observed at the satellite with the riometer absorptions are investigated statistically for CNA (absorption >0.5 dB) and non-CNA (absorption <0.5 dB) cases separately. During CNA events, Arase observed elevated electron flux in the medium energy range (2–100 keV), and plasma wave activity in the whistler-mode frequency range (0.5–3 kHz) of the spectra. Our study provides an estimate of the statistical dependence of the electron flux and plasma wave observations at Arase with the ground reality of actual precipitation.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 127
Issue: 5
Article number: e2022JA030271
DOI: 10.1029/2022JA030271
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: Authors are grateful to GFZ Helmholtz Centre Potsdam for providing the Kp index ( and WDC Kyoto for providing the AE index ( used in this study. Antti Kero is funded by the Tenure Track Project in Radio Science at Sodankylä Geophysical Observatory/ University of Oulu, and partly Finnish Academy project #347796. Yoshizumi Miyoshi is supported by JSPS KAKENHI 15H05747, 16H06286, 20H01955, 20H01959, 21H04526.
Academy of Finland Grant Number: 347796
Detailed Information: 347796 (Academy of Finland Funding decision)
Copyright information: © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.