MMS observations of electron-scale filamentary currents in the reconnection exhaust and near the X line - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2016

MMS observations of electron-scale filamentary currents in the reconnection exhaust and near the X line

, , , , , , , , , , , , , , , , , , (1, 2) , , , , , , , , , , ,
1
2
T. D. Phan
J. P. Eastwood
  • Function : Author
P. A. Cassak
  • Function : Author
M. Øieroset
  • Function : Author
J. T. Gosling
  • Function : Author
D. J. Gershman
  • Function : Author
F. S. Mozer
  • Function : Author
M. A. Shay
  • Function : Author
M. Fujimoto
  • Function : Author
W. Daughton
  • Function : Author
J. F. Drake
  • Function : Author
J. L. Burch
  • Function : Author
R. B. Torbert
  • Function : Author
R. E. Ergun
  • Function : Author
L. J. Chen
  • Function : Author
S. Wang
  • Function : Author
C. Pollock
  • Function : Author
J. C. Dorelli
  • Function : Author
B. L. Giles
  • Function : Author
T. E. Moore
  • Function : Author
Y. Saito
  • Function : Author
L. A. Avanov
  • Function : Author
W. Paterson
  • Function : Author
R. J. Strangeway
  • Function : Author
C. T. Russell
  • Function : Author
Y. Khotyaintsev
P. A. Lindqvist
  • Function : Author
M. Oka
  • Function : Author
F. D. Wilder
  • Function : Author

Abstract

We report Magnetospheric Multiscale observations of macroscopic and electron-scale current layers in asymmetric reconnection. By intercomparing plasma, magnetic, and electric field data at multiple crossings of a reconnecting magnetopause on 22 October 2015, when the average interspacecraft separation was ~10 km, we demonstrate that the ion and electron moments are sufficiently accurate to provide reliable current density measurements at 30 ms cadence. These measurements, which resolve current layers narrower than the interspacecraft separation, reveal electron-scale filamentary Hall currents and electron vorticity within the reconnection exhaust far downstream of the X line and even in the magnetosheath. Slightly downstream of the X line, intense (up to 3 μA/m2) electron currents, a super-Alfvénic outflowing electron jet, and nongyrotropic crescent shape electron distributions were observed deep inside the ion-scale magnetopause current sheet and embedded in the ion diffusion region. These characteristics are similar to those attributed to the electron dissipation/diffusion region around the X line.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2016 - Phan - MMS observations of electron%u2010scale filamentary currents in the reconnection.pdf (8.26 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03669488 , version 1 (16-05-2022)

Licence

Copyright

Identifiers

Cite

T. D. Phan, J. P. Eastwood, P. A. Cassak, M. Øieroset, J. T. Gosling, et al.. MMS observations of electron-scale filamentary currents in the reconnection exhaust and near the X line. Geophysical Research Letters, 2016, 43, pp.6060-6069. ⟨10.1002/2016GL069212⟩. ⟨insu-03669488⟩
7 View
4 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More