Such local components cause some error in estimating the baseline level of EU or EL. If the number is few, EDst may include some local fluctuations: the partial ring current component, substorm component and so on. (2008) fluctuates depending on the number of stations in the nightside sector (LT = 18-06). The baseline levels of EU and EL are obtained by averaging the H-component magnetic variations observed at the nightside (LT = 18-06) MAGDAS/ CPMN stations along the magnetic equator. EU and EL mainly represent the range of EEJ and CEJ (equatorial counter electrojet) components, respectively. Group, M.ĮE-index (EDst, EU, and EL) is a new index proposed by Space Environment Research Center, Kyushu University (see Uozumi et al., 2008) to monitor temporal and long-term variations of the equatorial electrojet (EEJ). It is also found that the H-component power ratio AD/ AY of Pc 3 increased three times just a few weeks before the earthquake and after one week decreased to the normal level, where AD is one-day power at Rikubetsu station and AY is the one-year-average power.Ī Proxy Method for Estimation of EE-index using MAGDAS/ CPMN Data From a case study of the 2 Kushiro earthquake with magnitude M = 6.4, we found a peculiar increase of H-component power ratio AR/ AM of Pc 3 magnetic pulsations a few weeks before the earthquake, where AR is the power obtained at Rikubetsu station ( r = 61 km) near the epicenter and AM is the power obtained at a remote reference station, Moshiri ( r = 205 km). In connection with this project, we propose a new ultra-low frequency (ULF) wave analysis method to study ULF anomalies associated with large earthquakes using magnetic data. This project intends to get the MAGDAS network fully operational and provide data for studies on space and lithosphere weather. The Space Environment Research Center of Kyushu University has obtained geomagnetic data in the Circum-pan Pacific Magnetometer Network ( CPMN) region for over 10 years, and has recently deployed a new real-time Magnetic Data Acquisition System (MAGDAS) in the CPMN region and an FM-CW radar network along the 210° magnetic meridian (MM) for space weather research and applications. A new ULF wave analysis for Seismo-Electromagnetics using CPMN/MAGDAS data
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