Volume 33 Issue 5
Sep.  2013
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Article Navigation >  Chinese Journal of Space Science  > 2013  >  33(5): 486-493
Zhang Qingmei, Sun Tianran, Zhang Jiaojiao, Li Chuanqi, Wang Chi. Response of the Ionospheric Equivalent Current Systems to Interplanetary Shocks[J]. Chinese Journal of Space Science, 2013, 33(5): 486-493. doi: 10.11728/cjss2013.05.486
Citation: Zhang Qingmei, Sun Tianran, Zhang Jiaojiao, Li Chuanqi, Wang Chi. Response of the Ionospheric Equivalent Current Systems to Interplanetary Shocks[J]. Chinese Journal of Space Science, 2013, 33(5): 486-493. doi: 10.11728/cjss2013.05.486
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Response of the Ionospheric Equivalent Current Systems to Interplanetary Shocks

doi: 10.11728/cjss2013.05.486
  • 1.

    College of Math and Statistics, Nanjing University of Information Science and Technology, Nanjing 210044

  • 2.

    State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190

  • 3.

    College of Electronic Engineering, Guangxi Normal University, Guilin 541004

  • Received Date: 2012-12-05
  • Rev Recd Date: 2013-04-01
  • Publish Date: 2013-09-15
    Abstract
  • Interplanetary (IP) shocks, one of the important causes of the magnetosphere ionosphere disturbances, could affect the geo-magnetic field by changing the current systems in the magnetosphere——ionosphere region. By using a global three dimensional MHD simulation code, we analyze the immediate responses of the Equivalent Current Systems (ECS) in the Earth's ionosphere to the impact of IP shocks. The model results show that after the shock arrival a pair of abnormal Field-Aligned Current (FAC) appears, flowing into and out of the ionosphere on the dusk and dawn side respectively. Also developed in the ionosphere is the two-cell ECS: an anticlockwise circulation in the dawn hemisphere and a clockwise one in the dusk hemisphere. The two ECS vortices shift poleward and tailward after their formation. In the meantime, their intensities increase at first and then decrease to virtually disappear within tens of seconds. At last the ECS pattern reaches a quasi-steady state which is controlled by the interplanetary conditions downstream of the IP shock. The quantitative characteristics of such response processes depend on the intensity of the IP shock: for a stronger shock, the two-cell ECS becomes more intense, and its lifetime is shorter.

     

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