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Quantitative analysis of a Hall system in the exhaust of asymmetric magnetic reconnection

Zhang, Y. C. (författare)
Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.;Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China.;Univ Toulouse UPS, Inst Rech & Astrophys & Planotol, Toulouse, France.;Ctr Natl Rech Sci, Toulouse, France.
Lavraud, B. (författare)
Univ Toulouse UPS, Inst Rech & Astrophys & Planotol, Toulouse, France.;Ctr Natl Rech Sci, Toulouse, France.
Dai, L. (författare)
Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
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Wang, C. (författare)
Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Marchaudon, A. (författare)
Univ Toulouse UPS, Inst Rech & Astrophys & Planotol, Toulouse, France.;Ctr Natl Rech Sci, Toulouse, France.
Avanov, L. (författare)
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.;Univ Maryland, Dept Astron, College Pk, MD 20742 USA.,Royal Inst Technol, Stockholm, Sweden.
Burch, J. (författare)
Southwest Res Inst, San Antonio, TX USA.
Chandler, M. (författare)
NASA, Marshall Space Flight Ctr, Huntsville, AL USA.
Dorelli, J. (författare)
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.;Univ Maryland, Dept Astron, College Pk, MD 20742 USA.
Duan, S. P. (författare)
Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Ergun, R. E. (författare)
Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO USA.
Gershman, D. J. (författare)
Giles, B. (författare)
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
Khotyaintsev, Yuri V. (författare)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Lindqvist, Per-Arne (författare)
KTH,Rymd- och plasmafysik
Paterson, W. (författare)
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
Russell, C. T. (författare)
Univ Calif Los Angeles, Los Angeles, CA USA.,Univ New Hampshire, Phys Dept, Durham, NH 03824 USA.
Schiff, C. (författare)
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
Tang, B. B. (författare)
Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Torbert, R. (författare)
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Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China;Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China.;Univ Toulouse UPS, Inst Rech & Astrophys & Planotol, Toulouse, France.;Ctr Natl Rech Sci, Toulouse, France. Univ Toulouse UPS, Inst Rech & Astrophys & Planotol, Toulouse, France.;Ctr Natl Rech Sci, Toulouse, France. (creator_code:org_t)
Blackwell Publishing Ltd, 2017
2017
Engelska.
Ingår i: Journal of Geophysical Research - Space Physics. - : Blackwell Publishing Ltd. - 2169-9380 .- 2169-9402. ; 122:5, s. 5277-5289
Relaterad länk:
https://urn.kb.se/re...
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https://doi.org/10.1...
https://urn.kb.se/re...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Taking advantage of high-resolution measurements from the MMS mission, we find evidence for a complete Hall system in the exhaust of asymmetric magnetic reconnection 40 Di downstream of the X line. The investigation of the fine structure of the Hall system reveals that it displays features in the exhaust similar to those reported previously in the ion diffusion region by simulations and observations. This finding confirms the importance of particle-scale processes in the reconnection exhaust as well. On the magnetospheric side of the exhaust, electrons are strongly accelerated by parallel electric fields. This process significantly contributes to feed the Hall current system, resulting in a nonnegligible Hall magnetic field signature on this side despite an otherwise lower density. Calculation of the induced out-of-plane magnetic field by in-plane currents (based on Biot-Savart law) provides direct quantitative evidence for the process of Hall magnetic field generation by the Hall current system. A strong normal Hall electric field is present only on the magnetospheric side of the exhaust region, consistent with previous works. Multipoint data analysis shows that the ion pressure gradient in the ion momentum equation produces this Hall electric field. This global pattern of the Hall system can be explained by kinetic Alfvén wave theory.

Ämnesord

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)

Nyckelord

asymmetric magnetic reconnection
Hall system
kinetic Alfvén wave
reconnection exhaust

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