Volume 40 Issue 6
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LI Shiyou, XIE Rong, XIAO Yang. Statistical Study on the Geomagnetic Substorm[J]. Journal of Space Science, 2020, 40(6): 1000-1006. doi: 10.11728/cjss2020.06.1000
Citation: LI Shiyou, XIE Rong, XIAO Yang. Statistical Study on the Geomagnetic Substorm[J]. Journal of Space Science, 2020, 40(6): 1000-1006. doi: 10.11728/cjss2020.06.1000

Statistical Study on the Geomagnetic Substorm

doi: 10.11728/cjss2020.06.1000
  • Received Date: 2019-07-22
  • Rev Recd Date: 2020-08-19
  • Publish Date: 2020-11-15
  • The substorm is a process that releases enormous energy in the magnetosphere, including auroral, ionospheric, magnetospheric and thermospheric substorms. The substorm can result in severe disturbances in the whole magnetosphere and ionosphere. In this work, the AL and AE indices are employed to analyze the substorm events in the 24th solar cycle. Statistical analysis is performed on the relationship between the intensity of substorm, the initial value of substorm and the recovery value, the duration of a substorm, the relationship between substorm recovery phase and the duration of the growth phase (including expansion phase) and so on. The statistical results show that: most of the substorm events occurred in the 24th solar activity cycle from 2008 to 2016 are severe, with the peak value of the substorm mostly around 200~1200nT; the duration of most of the substorms ranges from 100 to 400min, the duration of the recovery phase of most of the substorms is between 60 to 300min, and presents the normal distribution characteristics; the recovery phase duration of most substorm events is less than 10 times of the growth phase duration. The statistical results on the substorm are helpful for further understanding of the occurrence and development of substorm in the magnetosphere. Therefore, it is of practical significance to further understand the energy evolution process in the magnetosphere.

     

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