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Chinese Journal of Space Science ›› 2015, Vol. 35 ›› Issue (5): 533-540.doi: 10.11728/cjss2015.05.533

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Analysis On The Distribution Of Geomagnetic Storm Number

LIU Yumei, CHEN Chun, SUN Shuji, BAN Panpan   

  1. National Key Laboratory of Electromagnetic Environment, China Research Institute ofRadiowave Propagation, Qingdao 266107
  • Received:2014-07-24 Revised:2014-09-22 Online:2015-08-15 Published:2015-09-03

Abstract:

A geomagnetic storm is a global disturbance in Earth's magnetic field, which is caused by various solar phenomenon. Dst index is the most widely used index which denotes the intensity of magnetic storm activity. The distributions of moderate geomagnetic storms (-100<Dst≤ -50nT) and intense geomagnetic storms (Dst≤ -100nT) and their causes in 1957-2008 are identified. Moreover, annual average number of geomagnetic storm in ascending phase, maximum phase, declining phase, and minimum phase of solar activity was analyzed according to different kinds of geomagnetic storms. It is found that the total number of geomagnetic storm in maximum phase year is greater than that in minimum phase year of the same solar activity, and there is close relation between the average number of Sun spots per year and the total number of geomagnetic storm. A dominant dual-peak distribution usually exists in the solar cycle variability of intense geomagnetic storm, but a dual-peak distribution of moderate geomagnetic storm exists and a trinal-peak distribution appears in intense geomagnetic storm. The presence of the extra peak might be attributing to a typical year compared to other rising phase years. On the other hand, another possibility is that 1999 could be an unusual year, with a low rate of intense magnetic storm. The magnetic storms mainly happen in equinox, and the number of magnetic storm is obviously changed with the increased Dst index.

Key words: Geomagnetic storm, Solar cycle, Average occurrence rate, Sunspot number

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