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Failed self-reformation of a sub-critical fast magnetosonic shock in collisionless plasma
ELI-Beamlines, Institute of Physics, Czech Academy of Sciences, 5 Kvetna 835, 25241 Dolní Břežany, Czech Republic.
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering. (Scientific Visualization)ORCID iD: 0000-0003-4055-0552
University of Bordeaux, Centre Lasers Intenses et Applications, CNRS, CEA, UMR 5107, F-33405 Talence, France.
University of Bordeaux, Centre Lasers Intenses et Applications, CNRS, CEA, UMR 5107, F-33405 Talence, France.
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2019 (English)In: Plasma Research Express, ISSN 2516-1067, Vol. 1, no 3, article id 035001Article in journal (Refereed) Published
Abstract [en]

We study with a 1D particle-in-cell (PIC) simulation the evolution of a subcritical perpendicular fast magnetosonic shock. The shock propagates at 1.5 times the fast magnetosonic speed. Some upstream protons are reflected by the shock's electric potential. They form a beam which carries less energy than those that are reflected magnetically by super-critical shocks. The beam triggers the growth of a fast magnetosonic solitary wave upstream of the shock, which reflects the beam protons back to the shock. Extracting the momentum and energy of this beam allows the solitary wave to grow into a proto-shock that is trailed by a short downstream region. Protons from the shock-reflected proton beam increase the density of the plasma between the shock and the proto-shock reducing its potential difference relative to both surrounding structures. Bulk protons, which cross the proto-shock, react to the decreased potential jump. The plasma behind the proto-shock accelerates and so does the shock. The trailing end of the proto-shock speeds up in order to continue reflecting the beam protons and eventually it catches up with its front; the proto-shock collapses and the self-reformation fails. A more energetic proton beam could decrease the potential jump across the shock, let it collapse and replace it with the proto-shock.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2019. Vol. 1, no 3, article id 035001
Keywords [en]
PIC simulation, collisionless plasma, magnetosonic shock
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:liu:diva-159034DOI: 10.1088/2516-1067/ab30baOAI: oai:DiVA.org:liu-159034DiVA, id: diva2:1338223
Available from: 2019-07-20 Created: 2019-07-20 Last updated: 2019-08-22Bibliographically approved

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Dieckmann, Mark E

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