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Chinese Journal of Space Science ›› 2019, Vol. 39 ›› Issue (2): 149-157.doi: 10.11728/cjss2019.02.149

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Global MHD Results of Flux Transfer Events at the Dayside Magnetopause under High Solar Wind Speed

CHEN Chen1,2, HUANG Zhaohui1, SUN Tianran1, TANG Binbin1, WANG Chi1,2   

  1. 1. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190;
    2. University of Chinese Academy of Sciences, Beijing 100049
  • Received:2018-04-10 Revised:2018-07-08 Online:2019-03-15 Published:2019-03-27

Abstract:

Using Global MHD model, the spatial distribution of Flux Transfer Events (FTE) at the dayside magnetopause under high solar wind speed is investigated. The solar wind conditions of this case are vsw=1200 km·s-1, nsw=3 cm-3, Bz=-8.3 nT, By=8.3 nT and Bx=0 nT. The simulation results virtually agree with those expected FTE signatures from observations, and bipolar signatures and related variations of number density, pressure and velocity are found. A total number of 39 FTE are observed by ten virtual probes which are spread over the magnetopause from y=-5Re to y=5Re. 14 FTE are found when the probe is near to the noon. However, when the probe is located near y=-5Re and y=5Re, the same number, 3, of FTE in both locations is found. Furthermore, 8 FTE are found when the probe is adjacent to y=-2.5Re and 11 FTE are found near y=2.5Re. In a nutshell, the number of FTE decreases as the observed probes approach the flank of the magnetopause, which could be caused by the distribution of solar wind velocity in magnetosheath.

Key words: Flux transfer events, High solar wind speed, MHD simulation

CLC Number: