1. Department of Earth and Planetary Sciences; Kyushu University; Fukuoka Japan
2. Space Environment Research Center; Kyushu University; Fukuoka Japan
3. Manila Observatory; Manila Philippines
4. IPS Radio and Space Services; Bureau of Meteorology; Haymarket, New South Wales Australia
5. Institute of Cosmophysical Research and Radio Wave Propagation; Far Eastern Branch of the Russian Academy of Sciences; Paratunka Russia
6. Institute of Cosmophysical Research and Aeronomy; Siberian Branch of the Russian Academy of Sciences; Yakutsk Russia