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《Seismological and Geomagnetic Observation and Research》 2007-01
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Recognition of magnetic storms at the early stage with the horizontal component of geomagnetism

Yi Shihua, Li Xihai and Li Zhigang(The Second Artillery Engineering Institute, Xi′an 710025,China)  
In this paper, we extract the energy feature of the horizontal component of geomagnetism with wavelet packet analysis. Then we have investigated the variation of recognition rate at different time length t=1 h, and identified by use of Fisher′s method. When, the average recognition rate of magnetic storms comes to 83.8%. If known being magnetic storm, the average recognition rate is 72.9%, at the same time it is classified into strong magnetic storm (geomagnetic activity index K≥8) and other magnetic storm (K≤7). If the horizontal component of geomagnetism is observed continually and in real time, the recognition of magnetic storm at the early stage can be realized in this way.
【CateGory Index】: P318
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