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  • Zhang, L. Q.Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China. (author)

MMS Observation on the Cross-Tail Current Sheet Roll-up at the Dipolarization Front

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • American Geophysical Union (AGU),2021
  • electronicrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:uu-444923
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444923URI
  • https://doi.org/10.1029/2020JA028796DOI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We perform a case study on the evolution of the current sheet in different regions around the dipolarization front (DF), including magnetic-dip preceding the DF, front at the DF, and magnetic pileup region (MPR) behind the DF based on magnetospheric multiscale (MMS) observation on July 31, 2017. In this event, MMS1 stays inside the current sheet during the whole bursty bulk flow (BBF) interval. Our analysis reveals that the cross-tail current sheet at the DF is rolled up, signified by the depression (-V-z/-B-z) at the dip and elevation (+V-z/+B-z) at the front. The minimum variance analysis on the magnetic field method is applied to obtain the normal direction of the current sheet. The result confirms the roll-up, that is, downward at the depressed current sheet and upward at the elevated current sheet. The current sheet roll-up at the DF is asymmetric, with steeper elevation than depression. The elevation angle of the elevated current sheet is evaluated to be similar to 30 degrees. Strong duskward and predominantly perpendicular J spike (similar to 90 nA/m(2)) concentrate at the interface between the dip and the front. The strength of the current of the J-spike is about nine/three times the current at the dip/front. The front is characterized by positive E center dot J. In the dip/MPR, no such preference is seen. Ion/Electron pitch angle distributions exhibit significant and different evolutions in the roll-up current sheet from dip to front, including their energy-dependence and distributions. Finally, the roll-up current sheet could decelerate BBF and change the flow structure. The potential significance of the roll-up current sheet on BBF evolution is emphasized.

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  • Wang, C.Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China. (author)
  • Dai, L.Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China. (author)
  • Fu, H. S.Beihang Univ, Sch Space & Environm, Beijing, Peoples R China.;Univ Calif Los Angeles, Space Sci, Los Angeles, CA USA. (author)
  • Lui, A. T. Y.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA. (author)
  • Baumjohann, W.Austrian Acad Sci, Space Res Inst, Graz, Austria. (author)
  • Yu, Y.Beihang Univ, Sch Space & Environm, Beijing, Peoples R China.;Univ Calif Los Angeles, Space Sci, Los Angeles, CA USA. (author)
  • Ren, Y.Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China. (author)
  • Burch, James L.Southwest Res Inst San Antonio, San Antonio, TX USA. (author)
  • Khotyaintsev, Yuri V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)ykh28990 (author)
  • Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing, Peoples R China.Beihang Univ, Sch Space & Environm, Beijing, Peoples R China.;Univ Calif Los Angeles, Space Sci, Los Angeles, CA USA. (creator_code:org_t)

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  • In:Journal of Geophysical Research - Space Physics: American Geophysical Union (AGU)126:42169-93802169-9402

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By the author/editor
Zhang, L. Q.
Wang, C.
Dai, L.
Fu, H. S.
Lui, A. T. Y.
Baumjohann, W.
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Yu, Y.
Ren, Y.
Burch, James L.
Khotyaintsev, Yu ...
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