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Departure from MHD prescriptions in shock formation over a guiding magnetic field
ETSI Industriales, Universidad de Castilla-La Mancha, Ciudad Real, Spain.
Physics Department, University College Cork, Cork, Ireland.
Department of Astronomy, Columbia University, New York, NY, USA.
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten. (Scientific Visualization)ORCID-id: 0000-0003-4055-0552
Vise andre og tillknytning
2017 (engelsk)Inngår i: Laser and particle beams (Print), ISSN 0263-0346, E-ISSN 1469-803X, Vol. 35, s. 513-519Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In plasmas where the mean-free-path is much larger than the size of the system, shock waves can arise with a front much shorter than the mean-free path. These so-called "collisionless shocks" are mediated y collective plasma interactions. Studies conducted so far on these shocks found that although binary collisions are absent, the distribution functions are thermalized downstream by scattering on the fields, so that magnetohydrodynamic prescriptions may apply. Here we show a clear departure from this pattern in the case of Weibel shocks forming over a flow-aligned magnetic field. A micro-physical analysis of the particle motion in the Weibel filaments shows how they become unable to trap the flow in the presence of too strong a field, inhibiting the mechanism of shock formation. Particle-in-cell simulations confirm these results.

sted, utgiver, år, opplag, sider
Cambridge University Press, 2017. Vol. 35, s. 513-519
Emneord [en]
plasma shock, kinetic theory, PIC simulation
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-140164DOI: 10.1017/S0263034617000519ISI: 000409042200017OAI: oai:DiVA.org:liu-140164DiVA, id: diva2:1137922
Merknad

Funding agencies: European Union Seventh Framework Program [618499]; NASA [NNX12AO83G, TCAN NNX14AB47G, NAS8-03060]; NASA - Chandra X-ray Center [PF4-150126];  [ENE2013-45661-C2-1-P];  [PEII-2014-008-P];  [ANR-14-CE33-0019 MACH];  [SNIC2015-1-305]

Tilgjengelig fra: 2017-09-02 Laget: 2017-09-02 Sist oppdatert: 2017-11-03bibliografisk kontrollert

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