HR: 0800h
AN: GP21A-04    [Abstracts]
TI: New substorm index derived from high-resolution geomagnetic field data at low latitude and its comparison with real-time AE index
AU: Nosé, M
AF: Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
AU: * Cifuentes-Nava, G
AF: Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, Coyoacan, 04510, Mexico, D.F., Mexico
AU: Iyemori, T
AF: Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
AU: Takeda, M
AF: Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
AU: Ookawa, T
AF: Kakioka Magnetic Observatory, Japan Meteorological Agency, 595 Kakioka, Ishioka, Ibaraki, 315-0116, Japan
AU: Matzka, J
AF: Geomagnetism and Space Physics, Danish Meteorological Institute, Lyngbyvej 100, DK 2100 Copenhagen, Denmark
AU: Tunçer, M K
AF: Geomagnetism Laboratory, Kandilli Campus, Boğaziçi University, 81220, Çengelköy, Istanbul, Turkey
AB: Geomagnetic field data with high time resolution (i.e., 1 second) become more popular recently. Using such high time resolution data, we can identify Pi2 pulsations which have a period of 40-150 s and an irregular waveform. It is generally accepted that Pi2 pulsations appear clearly in mid- or low-latitude ground station on the nightside in close connection with substorm onsets. Thus we can monitor substorm activity at any given time if we examine Pi2 activity at multiple geomagnetic observatories which distribute globally with longitudinal separation of ~120° or less. Here we propose a new index reflecting Pi2 wave power at low- and mid-latitude. This index is derived by wavelet analysis for geomagnetic field data obtained at three different longitudinal sectors, that is, the Asia, Europe, and North/Middle America sectors. Possible observatories are Kakioka, Teoloyucan, Iznik, and Füstenfeldbruck. We will make a comparison of substorm activity estimated from this new index and that from the AE index.
DE: 2752 MHD waves and instabilities (2149, 6050, 7836)
DE: 2788 Magnetic storms and substorms (7954)
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Joint Assembly