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Shocks in unmagnetized plasma with a shear flow: Stability and magnetic field generation
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten. (Scientific Visualization)ORCID-id: 0000-0003-4055-0552
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten. (Scientific Visualization)ORCID-id: 0000-0002-2849-6146
Centre for Plasma Physics (CPP), Queen's University Belfast, BT7 1NN, Belfast, UK.
Centre for Plasma Physics (CPP), Queen's University Belfast, BT7 1NN, Belfast, UK.
Vise andre og tillknytning
2015 (engelsk)Inngår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 22, nr 7, s. 1-9, artikkel-id 072104Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A pair of curved shocks in a collisionless plasma is examined with a two-dimensional particle-in-cell simulation. The shocks are created by the collision of two electron-ion clouds at a speed that exceeds everywhere the threshold speed for shock formation. A variation of the collision speed along the initially planar collision boundary, which is comparable to the ion acoustic speed, yields a curvature of the shock that increases with time. The spatially varying Mach number of the shocks results in a variation of the downstream density in the direction along the shock boundary. This variation is eventually equilibrated by the thermal diffusion of ions. The pair of shocks is stable for tens of inverse ion plasma frequencies. The angle between the mean flow velocity vector of the inflowing upstream plasma and the shock's electrostatic field increases steadily during this time. The disalignment of both vectors gives rise to a rotational electron flow, which yields the growth of magnetic field patches that are coherent over tens of electron skin depths.

sted, utgiver, år, opplag, sider
American Institute of Physics (AIP), 2015. Vol. 22, nr 7, s. 1-9, artikkel-id 072104
Emneord [en]
Electrostatic shock, laser plasma, magnetic field generation, stability
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-120108DOI: 10.1063/1.4926525ISI: 000358933600007OAI: oai:DiVA.org:liu-120108DiVA, id: diva2:840761
Tilgjengelig fra: 2015-07-09 Laget: 2015-07-09 Sist oppdatert: 2017-12-04

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Forlagets fullteksthttp://scitation.aip.org/content/aip/journal/pop/22/7/10.1063/1.4926525

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Dieckmann, Mark EricBock, AlexanderYnnerman, Anders

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