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Bifurcated Current ...
Bifurcated Current Sheet Observed on the Boundary of Kelvin-Helmholtz Vortices
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Hwang, K.-J. (författare)
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- Dokgo, K. (författare)
- Southwest Res Inst, San Antonio, TX 78238 USA.
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- Choi, E. (författare)
- Southwest Res Inst, San Antonio, TX 78238 USA.
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- Burch, J. L. (författare)
- Southwest Res Inst, San Antonio, TX 78238 USA.
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- Sibeck, D. G. (författare)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Giles, B. L. (författare)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Norgren, C. (författare)
- Univ Bergen, Dept Phys & Technol, Bergen, Norway.
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- Nakamura, T. K. M. (författare)
- Karl Franzens Univ Graz, Inst Phys, Graz, Austria.;Austrian Acad Sci OAW, Space Res Inst, Graz, Austria.
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- Graham, Daniel B. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Khotyaintsev, Yuri (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Shi, Q. Q. (författare)
- Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China.
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- Gershman, D. J. (författare)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Pollock, C. J. (författare)
- Denali Sci LLC, Fairbanks, AK USA.
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- Ergun, R. E. (författare)
- Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO USA.
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- Torbert, R. B. (författare)
- Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA.
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- Russell, C. T. (författare)
- Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA.
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- Strangeway, R. J. (författare)
- Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA.
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Southwest Res Inst, San Antonio, TX 78238 USA NASA, Goddard Space Flight Ctr, Greenbelt, MD USA. (creator_code:org_t)
- 2021-11-05
- 2021
- Engelska.
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Ingår i: Frontiers in Astronomy and Space Sciences. - : Frontiers Media S.A.. - 2296-987X. ; 8
- Relaterad länk:
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https://doi.org/10.3...
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https://uu.diva-port... (primary) (Raw object)
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https://www.frontier...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- On May 5, 2017 MMS observed a bifurcated current sheet at the boundary of Kelvin-Helmholtz vortices (KHVs) developed on the dawnside tailward magnetopause. We use the event to enhance our understanding of the formation and structure of asymmetric current sheets in the presence of density asymmetry, flow shear, and guide field, which have been rarely studied. The entire current layer comprises three separate current sheets, each corresponding to magnetosphere-side sunward separatrix region, central near-X-line region, and magnetosheath-side tailward separatrix region. Two off-center structures are identified as slow-mode discontinuities. All three current sheets have a thickness of ∼0.2 ion inertial length, demonstrating the sub-ion-scale current layer, where electrons mainly carry the current. We find that both the diamagnetic and electron anisotropy currents substantially support the bifurcated currents in the presence of density asymmetry and weak velocity shear. The combined effects of strong guide field, low density asymmetry, and weak flow shear appear to lead to asymmetries in the streamlines and the current-layer structure of the quadrupolar reconnection geometry. We also investigate intense electrostatics waves observed on the magnetosheath side of the KHV boundary. These waves may pre-heat a magnetosheath population that is to participate into the reconnection process, leading to two-step energization of the magnetosheath plasma entering into the magnetosphere via KHV-driven reconnection.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- magnetic reconnection
- Kelvin-Helmholtz wave
- bifurcated current sheet
- magnetopause
- Kelvin-Helmholtz vortex
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Hwang, K.-J.
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Dokgo, K.
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Choi, E.
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Burch, J. L.
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Sibeck, D. G.
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Giles, B. L.
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visa fler...
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Norgren, C.
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Nakamura, T. K. ...
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Graham, Daniel B ...
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Khotyaintsev, Yu ...
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Shi, Q. Q.
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Gershman, D. J.
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Pollock, C. J.
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Ergun, R. E.
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Torbert, R. B.
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Russell, C. T.
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Strangeway, R. J ...
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Uppsala universitet