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Chinese Journal of Space Science ›› 2018, Vol. 38 ›› Issue (3): 307-314.doi: 10.11728/cjss2018.03.307

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Deflection of Magnetopause in the Distant Magnetotail

SHANG Wensai, LÜ Jianyong, WANG Ming, NI Sulan   

  1. Institute of Space Weather, Nanjing University of Information Science and Technology, Nanjing 210044
  • Received:2017-04-06 Revised:2017-10-03 Online:2018-05-15 Published:2018-05-12

Abstract:

The responses of the magnetopause in the distant magnetotail to the interplanetary and solar wind conditions, especially to the variation of the solar wind velocity, are studied by WIND and ARTEMIS data. It is found that the properties of sustaining dense high-speed flow were observed by P2 satellite in the magnetosphere on 13 September 2011, which suggests that the satellite passed through the magnetopause and entered the magnetosheath region. The data are analyzed using the minimum variable method. The results show that the normal of the magnetopause is along the direction of the solar wind velocity. According to the similar triangular theorem, it can be deduced that the deflection scale of the magnetopause is about 10Re and 6Re in y and z direction respectively. And the relative position of the P1 and P2 satellites also confirmed this opinion. The analyses suggest that the magnetopause location and shape in this event are mainly affected by the solar wind speed in the distant magnetotail. The result can provide observational evidence for establishing the magnetopause model which includes the effects of the solar wind vy and vz.

Key words: Distant magnetotail, Magnetopause, Solar wind velocity

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