1. Department of Geophysics, Graduate School of Science; Kyoto University; Kyoto Japan
2. Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
3. Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science; Kyoto University; Kyoto Japan
4. School of Space Research; Kyung Hee University; Gyeonggi South Korea
5. Hermanus Magnetic Observatory; Hermanus South Africa
6. School of Physics; University of KwaZulu-Natal; Durban South Africa