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Reconstruction of t...
Reconstruction of the Electron Diffusion Region of Magnetotail Reconnection seen by the MMS Spacecraft on 11July 2017
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- Hasegawa, H. (author)
- Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan.
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- Denton, R. E. (author)
- Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA.
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- Nakamura, R. (author)
- Austrian Acad Sci, Space Res Inst, Graz, Austria.
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- Genestreti, K. J. (author)
- Univ New Hampshire, Phys Dept, Durham, NH 03824 USA.;Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
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- Nakamura, T. K. M. (author)
- Austrian Acad Sci, Space Res Inst, Graz, Austria.,Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan
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- Hwang, K-J (author)
- Southwest Res Inst, San Antonio, TX USA.
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- Phan, T. D. (author)
- Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
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- Torbert, R. B. (author)
- Univ New Hampshire, Phys Dept, Durham, NH 03824 USA.;Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
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- Burch, L. (author)
- Southwest Res Inst, San Antonio, TX USA.,NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
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- Giles, B. L. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Gershman, D. J. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.;Oak Ridge Associated Univ, Washington, DC USA.
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- Russell, C. T. (author)
- Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA.
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- Strangeway, R. J. (author)
- Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA.
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- Lindqvist, Per-Arne (author)
- KTH,Rymd- och plasmafysik,Royal Inst Technol, Dept Space & Plasma Phys, Stockholm, Sweden
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- Khotyaintsev, Yuri V. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Ergun, R. E. (author)
- Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA.
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- Kitamura, N. (author)
- Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan.
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- Saito, Y. (author)
- Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan.
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Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA. (creator_code:org_t)
- AMER GEOPHYSICAL UNION, 2019
- 2019
- English.
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In: Journal of Geophysical Research - Space Physics. - : AMER GEOPHYSICAL UNION. - 2169-9380 .- 2169-9402. ; 124:1, s. 122-138
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
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- We present results from the reconstruction of the electron diffusion region of magnetotail reconnection observed by the Magnetospheric Multiscale (MMS) spacecraft on 11 July 2017. In the event, the conditions were suited for the reconstruction technique, developed by Sonnerup et al. (2016, https://doi.org/10.1002/2016JA022430), that produces magnetic field and electron streamline maps based on a two-dimensional, time-independent, inertialess form of electron magnetohydrodynamic equation, assuming an approximately symmetric current sheet and negligible guide magnetic field. For such a two-dimensional and steady structure, the X line orientation can be estimated from a method based on Ampere's law using single-spacecraft measurements of the magnetic field and electric current density. Our reconstruction results indicate that although the X point was not captured inside its tetrahedron, MMS approached the X point as close as one electron inertial length similar to 27 km. The opening angle of the recovered separatrix field line, combined with theory, suggests that the dimensionless reconnection rate was 0.17, which is consistent with the measured reconnection electric field 2-4 mV/m. The stagnation point of the reconstructed electron flow is shifted earthward of the X point by similar to 90 km, one possible interpretation of which is discussed. The energy conversion rate j . E' in the electron frame tends to be higher near the stagnation point, consistent with earlier observations and simulations, and is not correlated with the amplitude of broadband electrostatic waves observed in the upper-hybrid frequency range. The latter suggests that the waves did not contribute to energy dissipation in this particular electron diffusion region. Plain Language Summary Magnetic reconnection is a fundamental plasma process that controls transfer of solar wind energy and mass to planetary magnetospheres and causes explosive energy release associated with solar flares and sudden auroral brightening. National Aeronautics and Space Administration's Magnetospheric Multiscale (MMS) mission, which consists of four identical spacecraft launched in March 2015, aims at elucidating how magnetic reconnection works with unprecedented high temporal and spatial resolution measurements of charged particles and electromagnetic fields in space. MMS has been observing the Earth's magnetotail since May 2017 and encountered the central region of magnetic reconnection, called the electron diffusion region, on 11 July 2017. In this study, we present two-dimensional images of this region recovered from the MMS electron and magnetic field measurements, showing that the electron flow pattern in the electron diffusion region is not as simple as predicted by theory. The results provide new insights about the reconnection process in the actual space environment.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
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Hasegawa, H.
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Denton, R. E.
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Nakamura, R.
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Genestreti, K. J ...
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Nakamura, T. K. ...
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Hwang, K-J
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Phan, T. D.
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Torbert, R. B.
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Burch, L.
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Giles, B. L.
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Gershman, D. J.
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Russell, C. T.
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Strangeway, R. J ...
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Lindqvist, Per-A ...
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Khotyaintsev, Yu ...
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Ergun, R. E.
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Kitamura, N.
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Saito, Y.
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Royal Institute of Technology
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Uppsala University