1. Faculty of Science, University of the Ryukyus, Okinawa, Japan
2. Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
3. National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan
4. Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
5. Meisei Electric Co. Ltd., Gunma, Japan