1. The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
2. Graduate School of Science Kyoto University Kyoto Japan
3. Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science Kyoto University Kyoto Japan
4. Space Sciences Department The Aerospace Corporation Los Angeles CA USA
5. Department of Physics and Astronomy Rice University Houston TX USA
6. School of Physics and Astronomy University of Minnesota, Twin Cities Minneapolis MN USA
7. Center for Solar‐Terrestrial Research New Jersey Institute of Technology Newark NJ USA