[1] Meteorological Research Institute, Tsukuba, Ibaraki 305
[2] Department of Applied Physics, Fukuoka University, Jounan, Fukuoka, 814-01
[3] The National Institute for Environmental Studies, Tsukuba, Ibaraki 305
[4] Solar-Terrestrial Environment Laboratory, Nagoya University, Toyokawa, Aichi 442
[5] Communications Research Laboratory, Koganei, Tokyo 184
[6] Tohoku Institute of Technology, Taihaku, Sendai, Miyagi 982
[7] Department of Information Engineering, Shinshu University, Nagano 380
[8] Okinawa Weather Station, Naha, Okinawa 900
[9] Department of Electronics and Information Engineering, Tokyo Metropolitan University, Hachioji, Tokyo 192-03
[10] Department of Environment Science, University of Tsukuba, Tsukuba, Ibaraki 305