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Modification of the formation of high-Mach number electrostatic shock-like structures by the ion acoustic instability
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska högskolan. (Scientific Visualization)ORCID-id: 0000-0003-4055-0552
Queen's University Belfast, UK. (Centre for plasma physics)
Queen's University Belfast, UK. (Centre for plasma physics)
University of Potsdam, Germany . (Theoretical Astroparticle Physics group)
Vise andre og tillknytning
2013 (engelsk)Inngår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 20, nr 10, s. 102112-1-102112-12Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The formation of unmagnetized electrostatic shock-like structures with a high Mach number is examined with one-and two-dimensional particle-in-cell (PIC) simulations. The structures are generated through the collision of two identical plasma clouds, which consist of equally hot electrons and ions with a mass ratio of 250. The Mach number of the collision speed with respect to the initial ion acoustic speed of the plasma is set to 4.6. This high Mach number delays the formation of such structures by tens of inverse ion plasma frequencies. A pair of stable shock-like structures is observed after this time in the 1D simulation, which gradually evolves into electrostatic shocks. The ion acoustic instability, which can develop in the 2D simulation but not in the 1D one, competes with the nonlinear process that gives rise to these structures. The oblique ion acoustic waves fragment their electric field. The transition layer, across which the bulk of the ions change their speed, widens and their speed change is reduced. Double layer-shock hybrid structures develop.

sted, utgiver, år, opplag, sider
American Institute of Physics (AIP), 2013. Vol. 20, nr 10, s. 102112-1-102112-12
Emneord [en]
PIC simulation, electrostatic shock
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-99776DOI: 10.1063/1.4825339ISI: 000326644100030OAI: oai:DiVA.org:liu-99776DiVA, id: diva2:658151
Forskningsfinansiär
Swedish Research Council, 2010-4063Tilgjengelig fra: 2013-10-21 Laget: 2013-10-21 Sist oppdatert: 2017-12-06bibliografisk kontrollert

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