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Effective collision frequency due to ion-acoustic instability: Theory and simulations
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SYSNO ASEP 0104055 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Effective collision frequency due to ion-acoustic instability: Theory and simulations Title Efektivní srážková frekvence způsobená iontově-akustickou nestabilitou: Teorie a simulace Author(s) Hellinger, Petr (UFA-U) RID, ORCID
Trávníček, Pavel (UFA-U) RID, ORCID
Menietti, J. D. (US)Source Title Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 31, č. 10 (2004), L10806Number of pages 4 s. Language eng - English Country US - United States Keywords Magnetospheric Physics: Plasma waves and instabilities ; Space Plasma Physics: Kinetic and MHD theory ; Space Plasma Physics: Magnetic reconnection Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects ME 500 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) IAA3042403 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z3042911 - UFA-U, BC-A Annotation We study the ion-acoustic instability driven by a drift between Maxwellian protons and electrons in a nonmagnetized plasma using a Vlasov simulation with the realistic proton to electron mass ratio. Simulation results for similar electron and proton temperatures are in good agreement with predictions. Namely, during the linear and saturation phases the effective collision frequency observed in the simulation is in quantitative agreement with the quasi-linear predictions. However, previous estimates [ Galeev and Sagdeev, 1984 ; Labelle and Treumann, 1988 ] give the effective collision frequency less than one tenth the simulated values. The theoretical and simulation results are in a partial agreement with the simulation work by Watt et al. [2002] who used a non-realistic mass ratio. After the saturation, the effective collision frequency increases owing to the existence of backward-propagating ion-acoustic waves. These waves result from induced scattering on protons and contribute to the anomalous transport of electrons. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2005
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