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  • Genestreti, K. J.Austrian Acad Sci, Space Res Inst, Graz, Austria (author)

MMS Observation of Asymmetric Reconnection Supported by 3-D Electron Pressure Divergence

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • 2018
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-353223
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353223URI
  • https://doi.org/10.1002/2017JA025019DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We identify the electron diffusion region (EDR) of a guide field dayside reconnection site encountered by the Magnetospheric Multiscale (MMS) mission and estimate the terms in generalized Ohm's law that controlled energy conversion near the X-point. MMS crossed the moderate-shear (similar to 130 degrees) magnetopause southward of the exact X-point. MMS likely entered the magnetopause far from the X-point, outside the EDR, as the size of the reconnection layer was less than but comparable to the magnetosheath proton gyroradius, and also as anisotropic gyrotropic "outflow" crescent electron distributions were observed. MMS then approached the X-point, where all four spacecraft simultaneously observed signatures of the EDR, for example, an intense out-of-plane electron current, moderate electron agyrotropy, intense electron anisotropy, nonideal electric fields, and nonideal energy conversion. We find that the electric field associated with the nonideal energy conversion is (a) well described by the sum of the electron inertial and pressure divergence terms in generalized Ohms law though (b) the pressure divergence term dominates the inertial term by roughly a factor of 5:1, (c) both the gyrotropic and agyrotropic pressure forces contribute to energy conversion at the X-point, and (d) both out-of-the-reconnection-plane gradients (partial derivative/partial derivative M) and in-plane (partial derivative/partial derivative L, N) in the pressure tensor contribute to energy conversion near the X-point. This indicates that this EDR had some electron-scale structure in the out-of-plane direction during the time when (and at the location where) the reconnection site was observed.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Varsani, A.Austrian Acad Sci, Space Res Inst, Graz, Austria (author)
  • Burch, J. L.Southwest Res Inst, San Antonio, TX USA (author)
  • Cassak, P. A.West Virginia Univ, Dept Phys & Astron, Morgantown, WV USA (author)
  • Torbert, R. B.Southwest Res Inst, San Antonio, TX USA;Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA (author)
  • Nakamura, R.Austrian Acad Sci, Space Res Inst, Graz, Austria (author)
  • Ergun, R. E.Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA;Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA (author)
  • Phan, T-D (author)
  • Toledo-Redondo, S.ESAC, European Space Agcy, Sci Directorate, Madrid, Spain (author)
  • Hesse, M.Univ Bergen, Birkeland Ctr Space Sci, Bergen, Norway (author)
  • Wang, S.Univ Maryland, Astron Dept, College Pk, MD 20742 USA (author)
  • Giles, B. L.NASA, Goddard Space Flight Ctr, Heliophys Sci Div, Greenbelt, MD USA (author)
  • Russell, C. T.Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA (author)
  • Voros, Z.Austrian Acad Sci, Space Res Inst, Graz, Austria (author)
  • Hwang, K-J (author)
  • Eastwood, J. P.Imperial Coll London, Blackett Lab, London, England (author)
  • Lavraud, B.Inst Rech Astrophys & Planetol, Toulouse, France (author)
  • Escoubet, C. P.European Space Agcy, Space Sci Dept, Noordwijk, Netherlands (author)
  • Fear, R. C.Univ Southampton, Dept Phys & Astron, Southampton, Hants, England (author)
  • Khotyaintsev, Yuri V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)ykh28990 (author)
  • Nakamura, T. K. M.Austrian Acad Sci, Space Res Inst, Graz, Austria (author)
  • Webster, J. M.Rice Univ, Dept Phys & Astron, Houston, TX USA (author)
  • Baumjohann, W.Austrian Acad Sci, Space Res Inst, Graz, Austria (author)
  • Austrian Acad Sci, Space Res Inst, Graz, AustriaSouthwest Res Inst, San Antonio, TX USA (creator_code:org_t)

Related titles

  • In:Journal of Geophysical Research - Space Physics123:3, s. 1806-18212169-93802169-9402

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