Observation of double layer in the separatrix region during magnetic reconnection

Authors Organisations
  • Rongsheng Wang(Author)
    Chinese Academy of Sciences
  • Quanming Lu(Author)
    University of Science and Technology of China
  • Yuri V. Khotyaintsev(Author)
    Swedish Institute of Space Physics
  • Martin Volwerk(Author)
    Space Research Institute of the Austrian Academy of Sciences
  • Aimin Du(Author)
    Chinese Academy of Sciences
  • Rumi Nakamura(Author)
    Space Research Institute of the Austrian Academy of Sciences
  • Walter D. Gonzalez(Author)
    Instituto Nacional de Pesquisas Espaciais (INPE)
  • Xuan Sun(Author)
    University of Science and Technology of China
  • Wolfgang Baumjohann(Author)
    Space Research Institute of the Austrian Academy of Sciences
  • Xing Li(Author)
  • Tielong Zhang(Author)
    Space Research Institute of the Austrian Academy of Sciences
  • Andrew N. Fazakerley(Author)
    Mullard Space Science Laboratory
  • Can Huang(Author)
    University of Science and Technology of China
  • Mingyu Wu(Author)
    University of Science and Technology of China
Type Article
Original languageEnglish
Pages (from-to)4851-4858
Number of pages8
JournalGeophysical Research Letters
Volume41
Issue number14
DOI
Publication statusPublished - 28 Jul 2014
Links
Permanent link
Show download statistics
View graph of relations
Citation formats

Abstract

present in situ observation of double layer (DL) and associated electron measurement in the subspin time resolution in the separatrix region during reconnection for the first time. The DL is inferred to propagate away from the X line at a velocity of about ion acoustic speed and the parallel electric field carried by the DL can reach -20 mV/m. The electron displays a beam distribution inside the DL and streams toward the X line with a local electron Alfvén velocity. A series of electron holes moving toward the X line are observed in the wake of the DL. The identification of multiple similar DLs indicates that they are persistently produced and therefore might play an important role in energy conversion during reconnection. The observation suggests that energy dissipation during reconnection can occur in any region where the DL can reach.

Keywords

  • magnetic reconnection, double layers, electron holes