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

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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Submitted on : Tuesday, May 17, 2022 - 9:43:05 AM
Last modification on : Monday, July 4, 2022 - 10:21:29 AM

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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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