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Journal Articles Geophysical Research Letters Year : 2016

Magnetic reconnection and modification of the Hall physics due to cold ions at the magnetopause

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1
M. André
W. Li
S. Toledo-Redondo
  • Function : Author
Yu. V. Khotyaintsev
A. Vaivads
D. B. Graham
  • Function : Author
C. Norgren
J. Burch
P. -A. Lindqvist
  • Function : Author
G. Marklund
  • Function : Author
R. Ergun
R. Torbert
W. Magnes
C. T. Russell
  • Function : Author
B. Giles
T. E. Moore
  • Function : Author
M. O. Chandler
  • Function : Author
C. Pollock
  • Function : Author
D. T. Young
  • Function : Author
L. A. Avanov
  • Function : Author
J. C. Dorelli
  • Function : Author
D. J. Gershman
  • Function : Author
W. R. Paterson
  • Function : Author
Y. Saito
  • Function : Author

Abstract

Observations by the four Magnetospheric Multiscale spacecraft are used to investigate the Hall physics of a magnetopause magnetic reconnection separatrix layer. Inside this layer of currents and strong normal electric fields, cold (eV) ions of ionospheric origin can remain frozen-in together with the electrons. The cold ions reduce the Hall current. Using a generalized Ohm's law, the electric field is balanced by the sum of the terms corresponding to the Hall current, the v × B drifting cold ions, and the divergence of the electron pressure tensor. A mixture of hot and cold ions is common at the subsolar magnetopause. A mixture of length scales caused by a mixture of ion temperatures has significant effects on the Hall physics of magnetic reconnection.
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insu-03669467 , version 1 (17-05-2022)

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M. André, W. Li, S. Toledo-Redondo, Yu. V. Khotyaintsev, A. Vaivads, et al.. Magnetic reconnection and modification of the Hall physics due to cold ions at the magnetopause. Geophysical Research Letters, 2016, 43, pp.6705-6712. ⟨10.1002/2016GL069665⟩. ⟨insu-03669467⟩
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