Observations of an Electron-Cold Ion Component Reconnection at the Edge of an Ion-Scale Antiparallel Reconnection at the Dayside Magnetopause - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research Space Physics Année : 2021

Observations of an Electron-Cold Ion Component Reconnection at the Edge of an Ion-Scale Antiparallel Reconnection at the Dayside Magnetopause

S. Q. Zhao
  • Fonction : Auteur
H. Zhang
  • Fonction : Auteur
Terry Z. Liu
  • Fonction : Auteur
Huirong Yan
  • Fonction : Auteur
C. J. Xiao
  • Fonction : Auteur
Q. -G. Zong
  • Fonction : Auteur
Xiaogang Wang
  • Fonction : Auteur
Mijie Shi
  • Fonction : Auteur
Shangchun Teng
  • Fonction : Auteur
Huizi Wang
  • Fonction : Auteur
R. Rankin
  • Fonction : Auteur
C. Pollock
  • Fonction : Auteur
G. Le
  • Fonction : Auteur

Résumé

Solar wind parameters play a dominant role in reconnection rate, which controls the solar wind-magnetosphere coupling efficiency at Earth's magnetopause. Besides, low-energy ions from the ionosphere, frequently detected on the magnetospheric side of the magnetopause, also affect magnetic reconnection. However, the specific role of low-energy ions in reconnection is still an open question under active discussion. In the present work, we report in situ observations of a multiscale, multi-type magnetopause reconnection in the presence of low-energy ions using NASA's Magnetospheric Multiscale data on September 11, 2015. This study divides ions into cold (10-500 eV) and hot (500-30,000 eV) populations. The observations can be interpreted as a secondary reconnection dominated by electrons and cold ions (mainly in XYGSE plane) located at the edge of an ion-scale reconnection (mainly in XZGSE plane). This analysis demonstrates a dominant role of cold ions in the secondary reconnection without hot ions' response. Cold ions and electrons are accelerated and heated by the secondary process. The case study provides observational evidence for the simultaneous operation of antiparallel and component reconnection. Our results imply that the pre-accelerated and heated cold ions and electrons in the secondary reconnection may participate in the primary ion-scale reconnection affecting the solar wind-magnetopause coupling and the complicated magnetic field topology could affect the reconnection rate.
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Dates et versions

insu-03713754 , version 1 (06-08-2022)

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S. Q. Zhao, H. Zhang, Terry Z. Liu, Huirong Yan, C. J. Xiao, et al.. Observations of an Electron-Cold Ion Component Reconnection at the Edge of an Ion-Scale Antiparallel Reconnection at the Dayside Magnetopause. Journal of Geophysical Research Space Physics, 2021, 126, ⟨10.1029/2021JA029390⟩. ⟨insu-03713754⟩
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