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Strong current shee...
Strong current sheet at a magnetosheath jet : Kinetic structure and electron acceleration
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- Eriksson, Elin (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Rymd- och plasmafysik
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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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- Khotyaintsev, Yuri (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Yordanova, Emiliya (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Hietala, H. (author)
- Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA USA.
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- André, Mats (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Avanov, L. A. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Dorelli, J. C. (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.;Univ Maryland, Dept Astron, College Pk, MD 20742 USA.
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- Giles, B. L. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.,CNRS, IRAP, Toulouse, France.
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- Lavraud, B. (author)
- CNRS, IRAP, Toulouse, France.
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- Paterson, W. R. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Pollock, C. J. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Saito, Y. (author)
- JAXA, Chofu, Tokyo, Japan.
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- Magnes, W. (author)
- Austrian Acad Sci, Space Res Inst, Graz, Austria.
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Russell, C. (author)
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- Torbert, R. (author)
- Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA.
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- Ergun, R. (author)
- Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80309 USA.
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- Lindqvist, Per-Arne, 1954- (author)
- KTH,Rymd- och plasmafysik
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- Burch, J. (author)
- Southwest Res Inst, San Antonio, TX USA.
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(creator_code:org_t)
- American Geophysical Union (AGU), 2016
- 2016
- English.
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In: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 121:10, s. 9608-9618
- Related links:
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
Close
- Localized kinetic-scale regions of strong current are believed to play an important role in plasma thermalization and particle acceleration in turbulent plasmas. We present a detailed study of a strong localized current, 4900 nA m(-2), located at a fast plasma jet observed in the magnetosheath downstream of a quasi-parallel shock. The thickness of the current region is similar to 3 ion inertial lengths and forms at a boundary separating magnetosheath-like and solar wind-like plasmas. On ion scales the current region has the shape of a sheet with a significant average normal magnetic field component but shows strong variations on smaller scales. The dynamic pressure within the magnetosheath jet is over 3 times the solar wind dynamic pressure. We suggest that the current sheet is forming due to high velocity shears associated with the jet. Inside the current sheet we observe local electron acceleration, producing electron beams, along the magnetic field. However, there is no clear sign of ongoing reconnection. At higher energies, above the beam energy, we observe a loss cone consistent with part of the hot magnetosheath-like electrons escaping into the colder solar wind-like plasma. This suggests that the acceleration process within the current sheet is similar to the one that occurs at shocks, where electron beams and loss cones are also observed. Therefore, electron beams observed in the magnetosheath do not have to originate from the bow shock but can also be generated locally inside the magnetosheath.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Keyword
- High-Speed Jets
- Solar-Wind
- Subsolar Magnetosheath
- Scale Structures
- Plasma
- Magnetopause
- Shock
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Eriksson, Elin
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Vaivads, Andris
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Graham, Daniel. ...
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Khotyaintsev, Yu ...
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Yordanova, Emili ...
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Hietala, H.
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show more...
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André, Mats
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Avanov, L. A.
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Dorelli, J. C.
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Gershman, D. J.
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Giles, B. L.
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Lavraud, B.
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Paterson, W. R.
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Pollock, C. J.
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Saito, Y.
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Magnes, W.
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Russell, C.
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Torbert, R.
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Ergun, R.
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Lindqvist, Per-A ...
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Burch, J.
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- About the subject
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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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NATURAL SCIENCES
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and Earth and Relate ...
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and Geophysics
- Articles in the publication
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Journal of Geoph ...
- By the university
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Royal Institute of Technology
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Uppsala University