Volume 38 Issue 3
May  2018
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REN Nian, SHEN Chao, MA Yonghui. Tailward Expansion of the Plasma Sheet during a Substorm Using THEMIS Observations[J]. Journal of Space Science, 2018, 38(3): 315-331. doi: 10.11728/cjss2018.03.315
Citation: REN Nian, SHEN Chao, MA Yonghui. Tailward Expansion of the Plasma Sheet during a Substorm Using THEMIS Observations[J]. Journal of Space Science, 2018, 38(3): 315-331. doi: 10.11728/cjss2018.03.315

Tailward Expansion of the Plasma Sheet during a Substorm Using THEMIS Observations

doi: 10.11728/cjss2018.03.315
  • Received Date: 2017-04-12
  • Rev Recd Date: 2017-11-03
  • Publish Date: 2018-05-15
  • A moderately intense substorm from 10:40UT to 12:10UT on 13 March 2008 observed by THEMIS probes is examined to analyze the global evolution of the substorm in the magnetotail. During this substorm, five THEMIS probes are arranged along the x-axis in the vicinity of the midnight, from the radical distance of about 8.7 to 13.2Re. Magnetic field dipolarization and plasma sheet expansions are all observed by different probes after the substorm onset. The average velocity of the plasma sheet expansions is about 140km·s-1. Two types of dipolarization are detected in this substorm. One type is dipolarization front which is associated with the Bursty Bulk Flow (BBF). The other type is global dipolarization which is associated with plasma sheet expansions.The occurrence of Pi2 pulsation can be observed at low, medium and high latitudes 7 minutes later from the substrom onset. The amplitude of Pi2 pulsation gradually increases with the increase of latitude. The ion bulk velocity in the substorm event is mainly caused by the ion drift velocity, and the measured electric field is the induced electric field generated by the change of the local magnetic flux.

     

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