1. Space Environment Research Center; Kyushu University; Fukuoka Japan
2. Department of Earth and Planetary Science; Kyushu University; Fukuoka Japan
3. Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch; Russian Academy of Sciences; Yakutsk Russia
4. Institute of Cosmophysical Researches and Radio Wave Propagation; Kamchatka Russia
5. IPS Radio and Space Services; Bureau of Meteorology; Sydney, New South Wales Australia
6. Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
7. Department of Mechanical and Electrical Engineering; Tokuyama College of Technology; Yamaguchi Japan
8. Faculty of Education; Yamaguchi University; Yamaguchi Japan