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Estimates of Terms in Ohm's Law During an Encounter with an Electron Diffusion RegionWe 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 mVm (approximately 30-50%) of E+ U(sub 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.
Document ID
20170003531
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Torbert, R. B. (New Hampshire Univ. Durham, NH, United States)
Burch, J. L. (Southwest Research Inst. San Antonio, TX, United States)
Giles, B. L. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Gershman, D. (Maryland Univ. Greenbelt, MD, United States)
Pollock, C. J. (Denali Scientific, LLC Healy, AK, United States)
Dorelli, J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Avanov, L. A. (Maryland Univ. Greenbelt, MD, United States)
Argall, M. (New Hampshire Univ. Durham, NH, United States)
Shuster, J. (New Hampshire Univ. Durham, NH, United States)
Strangeway, R. (California Univ. Los Angeles, CA, United States)
Moore, T. E. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
April 17, 2017
Publication Date
June 16, 2016
Publication Information
Publication: Geophysical Research Letters
Volume: 43
Issue: 12
ISSN: 0094-8276
Subject Category
General
Report/Patent Number
GSFC-E-DAA-TN41227
Funding Number(s)
CONTRACT_GRANT: NNG04EB99C
CONTRACT_GRANT: NNG11PL02A
Distribution Limits
Public
Copyright
Other