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Electron currents and heating in the ion diffusion region of asymmetric reconnection
Author(s) -
Graham D. B.,
Khotyaintsev Yu. V.,
Norgren C.,
Vaivads A.,
André M.,
Lindqvist P.A.,
Marklund G. T.,
Ergun R. E.,
Paterson W. R.,
Gershman D. J.,
Giles B. L.,
Pollock C. J.,
Dorelli J. C.,
Avanov L. A.,
Lavraud B.,
Saito Y.,
Magnes W.,
Russell C. T.,
Strangeway R. J.,
Torbert R. B.,
Burch J. L.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl068613
Subject(s) - electric field , physics , electron , magnetic reconnection , ion , diffusion , magnetopause , atomic physics , electric current , magnetic field , computational physics , plasma diffusion , current density , particle acceleration , magnetosphere , quantum mechanics , thermodynamics
In this letter the structure of the ion diffusion region of magnetic reconnection at Earth's magnetopause is investigated using the Magnetospheric Multiscale (MMS) spacecraft. The ion diffusion region is characterized by a strong DC electric field, approximately equal to the Hall electric field, intense currents, and electron heating parallel to the background magnetic field. Current structures well below ion spatial scales are resolved, and the electron motion associated with lower hybrid drift waves is shown to contribute significantly to the total current density. The electron heating is shown to be consistent with large‐scale parallel electric fields trapping and accelerating electrons, rather than wave‐particle interactions. These results show that sub‐ion scale processes occur in the ion diffusion region and are important for understanding electron heating and acceleration.