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Study on the vorticity field within the tail reconnection jet by the MMS spacecraft
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  • Lingqian Zhang,
  • Wolfgang Baumjohann,
  • Liang Wang,
  • Chi Wang,
  • Y. Ren,
  • James L Burch,
  • Yuri V. Khotyaintsev,
  • Jiye Wang
Lingqian Zhang

Corresponding Author:[email protected]

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Wolfgang Baumjohann
Space Research Institute
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Liang Wang
Princeton University
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Chi Wang
National Space Science Center, Chinese Academy of Sciences
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Y. Ren
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James L Burch
Southwest Research Institute
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Yuri V. Khotyaintsev
Swedish Institute of Space Physics
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Jiye Wang
Central National University
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Based on direct measurement by the MMS spacecraft in the years of 2017 and 2018, we perform studies on the vorticity field () within the reconnection jet in the plasma sheet. A typical event on 26 July 2017 shows clearly the evolution of the field with the jet velocity: is weak in the decelerated BBF and strong in the fast BBF. The strongest -field is in the decaying BBF, around the dipolarization fronts. Despite the evolution of the BBF, the -field is characterized by the perpendicular vorticity (ω). Statistical results confirm the close correlation between BBF and . Higher means stronger . This accounts for the dawn-dusk asymmetry of the -field. The anisotropic is more significant in the V-dominating BBF than in the V-dominating BBF. The -field within the reconnection jet is β-dependence. The β-dependence -field tends to be stronger in super-M jet than in sub-M jet.