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Electron Energizati...
Electron Energization at a Reconnecting Magnetosheath Current Sheet
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- Eriksson, Elin, 1989- (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Institutionen för fysik och astronomi
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- Vaivads, Andris (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Graham, Daniel B. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Divin, Andrey (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Physics Department, St. Petersburg State University, St. Petersburg, Russia
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- Khotyaintsev, Yuri V. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Yordanova, Emiliya (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- André, Mats (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Institutionen för fysik och astronomi
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- Giles, Barbara L. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Pollock, Craig J. (author)
- Denali Sci LLC, Healy, AK USA.
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- Russell, Christopher T. (author)
- Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA.
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- Le Contel, Olivier (author)
- Univ Paris Sud, Sorbonne Univ, Observ Paris, Ecole Polytech,CNRS,Lab Phys Plasmas, Paris, France.
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- Torbert, Roy B. (author)
- Univ New Hampshire, Dept Phys, Durham, NH 03824 USA.
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- Ergun, Robert E. (author)
- Univ Colorado, Atmospher & Space Phys Lab, Campus Box 392, Boulder, CO 80309 USA.
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- Lindqvist, Per-Arne (author)
- KTH,Rymd- och plasmafysik
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- Burch, James L. (author)
- Southwest Res Inst, San Antonio, TX USA.
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(creator_code:org_t)
- American Geophysical Union (AGU), 2018
- 2018
- English.
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In: Geophysical Research Letters. - : American Geophysical Union (AGU). - 0094-8276 .- 1944-8007. ; 45:16, s. 8081-8090
- 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 observations of electron energization within a sub-ion-scale magnetosheath current sheet (CS). A number of signatures indicate ongoing reconnection, including the thickness of the CS (similar to 0.7 ion inertial length), nonzero normal magnetic field, Hall magnetic fields with electrons carrying the Hall currents, and electron heating. We observe localized electron acceleration and heating parallel to the magnetic field at the edges of the CS. Electrostatic waves observed in these regions have low phase velocity and small wave potentials and thus cannot provide the observed acceleration and heating. Instead, we find that the electrons are accelerated by a parallel potential within the separatrix regions. Similar acceleration has been reported based on magnetopause and magnetotail observations. Thus, despite the different plasma conditions in magnetosheath, magnetopause, and magnetotail, the acceleration mechanism and corresponding heating of electrons is similar. Plain Language Summary Magnetic reconnection is an important physical energy conversion process in astrophysical and laboratory plasmas. The easiest place to analyze magnetic reconnection is in near-Earth space. Due to lack of sufficient electron resolution of previous spacecraft missions, there are many unanswered questions regarding electron heating and acceleration processes at small scales. In particular, the regime where thermal pressure dominates over magnetic pressure, the most common state of plasmas in the Universe, is little explored. In this letter we study such a regime using the four-spacecraft Magnetospheric Multiscale mission. We analyze a reconnecting current sheet in the magnetosheath. We show that electrons are energized by a parallel potential, similar to what has been observed in the different plasma regimes the magnetopause and magnetotail. Thus, despite different plasma conditions, a similar acceleration mechanism and corresponding heating of electrons is occurring in all these regions.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- magnetic reconnection
- magnetosheath
- electron heating
- electron acceleration
- Magnetospheric Multiscale
- Fysik med inriktning mot rymd- och plasmafysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Eriksson, Elin, ...
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Vaivads, Andris
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Graham, Daniel B ...
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Divin, Andrey
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Khotyaintsev, Yu ...
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Yordanova, Emili ...
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show more...
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André, Mats
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Giles, Barbara L ...
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Pollock, Craig J ...
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Russell, Christo ...
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Le Contel, Olivi ...
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Torbert, Roy B.
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Ergun, Robert E.
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Lindqvist, Per-A ...
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Burch, James L.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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Geophysical Rese ...
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Royal Institute of Technology
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Uppsala University