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http://dx.doi.org/10.5140/JASS.2004.21.4.295

ARE STORM-TIME SUBSTORMS TRIGGERED OR SPONTANEOUS?  

Lee D.Y. (Department of Astronomy and Space Science, College of Natural Sciences and Institute for Basic Sciences Chungbuk National University)
Kim H.J. (Department of Astronomy and Space Science, College of Natural Sciences and Institute for Basic Sciences Chungbuk National University)
Choi C.R. (Department of Astronomy and Space Science, College of Natural Sciences and Institute for Basic Sciences Chungbuk National University)
Publication Information
Journal of Astronomy and Space Sciences / v.21, no.4, 2004 , pp. 295-302 More about this Journal
Abstract
Magnetic storms are almost always accompanied with substorms or substorm-like disturbances. Understanding the nature of the storm-time substorm is important for the currently critical issue of the storm-substorm relation. In this work we have done a statistical analysis in a straightforward way to see whether the storm-time substorms are preferably spontaneous or triggered. On the basis of 301 storm-time substorms selected for this work, we have found that the occurrence of about $28\%$ of them was spontaneous while only $6.5\%$ were associated with a clear trigger(s). The rest of the events were mostly associated with complex variations of IMF. The significant percentage for the spontaneous substorms implies that the possibility of finding a storm without a substorm is greatly reduced due to the spontaneous occurrence of the substorm even when the solar wind and IMF condition remains completely steady during the storm time.
Keywords
storm; substorm; IMF;
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