Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 13, Pages 6705-6712Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL069665
Keywords
magnetic reconnection; magnetopause; electric fields; Hall current
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Funding
- Swedish National Space Board [SNSB 139/12, 164/14, 176/15]
- CNES
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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 vxB 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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