Particle-in-cell simulations of ion-acoustic waves with application to Saturn's magnetosphere
2014 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 21, no 072122Article in journal (Refereed) Published
Using a particle-in-cell simulation, the dispersion and growth rate of the ion-acoustic mode areinvestigated for a plasma containing two ion and two electron components. The electron velocitiesare modelled by a combination of two kappa distributions, as found in Saturn’s magnetosphere.The ion components consist of adiabatic ions and an ultra-low density ion beam to drive a veryweak instability, thereby ensuring observable waves. The ion-acoustic mode is explored for a rangeof parameter values such as j, temperature ratio, and density ratio of the two electron components.The phase speed, frequency range, and growth rate of the mode are investigated. Simulations ofdouble-kappa two-temperature plasmas typical of the three regions of Saturn’s magnetosphere are also presented and analysed.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2014. Vol. 21, no 072122
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-151411DOI: 10.1063/1.4891320ISI: 000341154100024ScopusID: 2-s2.0-84904730356OAI: oai:DiVA.org:kth-151411DiVA: diva2:748551
QC 201409222014-09-192014-09-192014-10-03Bibliographically approved