1. Institute for Space‐Earth Environmental Research Nagoya University Nagoya Aichi Japan
2. National Institute of Information and Communications Technology Koganei Tokyo Japan
3. Department of Geophysics Tohoku University Sendai Miyagi Japan
4. Planetary Plasma and Atmospheric Research Center Tohoku University Sendai Miyagi Japan
5. Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Kanagawa Japan
6. Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
7. Word Data Center for Geomagnetism Graduate School of Science Kyoto University Kyoto Japan