Volume 40 Issue 4
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Article Navigation >  Chinese Journal of Space Science  > 2020  >  40(4): 471-478
ZHOU Zilu, ZUO Pingbing, SONG Xiaojian. Observation of a Slow Shock Associated with Reconnection Exhaust inside the Boundary Layer of Magnetic Cloud at 1 AU[J]. Chinese Journal of Space Science, 2020, 40(4): 471-478. doi: 10.11728/cjss2020.04.471
Citation: ZHOU Zilu, ZUO Pingbing, SONG Xiaojian. Observation of a Slow Shock Associated with Reconnection Exhaust inside the Boundary Layer of Magnetic Cloud at 1 AU[J]. Chinese Journal of Space Science, 2020, 40(4): 471-478. doi: 10.11728/cjss2020.04.471
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Observation of a Slow Shock Associated with Reconnection Exhaust inside the Boundary Layer of Magnetic Cloud at 1 AU

doi: 10.11728/cjss2020.04.471 cstr: 32142.14.cjss2020.04.471

  • 1 National Space Science Center, Chinese Academy of Sciences, Beijing 100190;

  • 2 University of Chinese Academy of Sciences, Beijing 100049;

  • 3 Institute of Space Science and Applied Technology, Harbin Institute of Technology, Shenzhen 518000

  • Received Date: 2019-05-20
  • Rev Recd Date: 2019-11-25
  • Publish Date: 2020-07-15
    Abstract
  • A pair of slow shocks in the Petschek reconnection model facilitate the energy transfer from magnetic field to kinetic and thermal energy of plasmas. In the past decade, a large amount of Petschek-like Reconnection Exhausts (RE) have been reported, but slow shocks bounding the REs are seldom identified. In this paper, a slow shock bounding a reconnection exhaust was identified in the front Boundary Layer (BL) of a Magnetic Cloud (MC) observed by WIND spacecraft on 27 February 2012. The observations of the jump conditions across the shock are in good agreement with the Rankine-Hugoniot relations. The intermediate Mach numbers are less than 1 on both sides of the shock. The slow Mach number is above unit (2.94) in the upstream side but below unit (0.65) in the downstream. The extremely low plasma beta (0.08) in the MC and the occurrence of magnetic reconnection in the MCBL may explain the formation of this slow shock.

     

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