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Estimates of terms in Ohm's law during an encounter with an electron diffusion region
Univ New Hampshire, Dept Phys, Durham, NH 03824 USA.;Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA.;Southwest Res Inst, San Antonio, TX 78238 USA..
Southwest Res Inst, San Antonio, TX 78238 USA..
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA..
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA..
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2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 12, 5918-5925 p.Article in journal (Refereed) Published
Abstract [en]

We present measurements from the Magnetospheric Multiscale (MMS) mission taken during a reconnection event on the dayside magnetopause which includes a passage through an electron diffusion region (EDR). The four MMS satellites were separated by about 10 km such that estimates of gradients and divergences allow a reasonable estimate of terms in the generalized Ohm's law, which is key to investigating the energy dissipation during reconnection. The strength and character of dissipation mechanisms determines how magnetic energy is released. We show that both electron pressure gradients and electron inertial effects are important, but not the only participants in reconnection near EDRs, since there are residuals of a few mV/m (similar to 30-50%) of E + U-e x B (from the sum of these two terms) during the encounters. These results are compared to a simulation, which exhibits many of the observed features, but where relatively little residual is present.

Place, publisher, year, edition, pages
2016. Vol. 43, no 12, 5918-5925 p.
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-307966DOI: 10.1002/2016GL069553ISI: 000380910100002OAI: oai:DiVA.org:uu-307966DiVA: diva2:1049139
Available from: 2016-11-23 Created: 2016-11-23 Last updated: 2016-11-23Bibliographically approved

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Khotyaintsev, Yuri
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Swedish Institute of Space Physics, Uppsala Division
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