1. Department of Geophysics, Graduate School of Science Tohoku University Miyagi Japan
2. Department of Earth and Planetary Science, Graduate school of Science The University of Tokyo Tokyo Japan
3. Department of Atmospheric and Oceanic Sciences University of California Los Angeles California USA
4. Center for Space Physics and Department of Electrical and Computer Engineering Boston University Boston Massachusetts USA
5. Institute for Space‐Earth Environment Research Nagoya University Nagoya Japan
6. Research Institute for Sustainable Humanosphere Kyoto University Kyoto Japan