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Magnetosheath plasma expansion: Hybrid simulations
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SYSNO ASEP 0088736 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Magnetosheath plasma expansion: Hybrid simulations Title Expanze plazmatu v magnetoobálce: hybridní simulace Author(s) Trávníček, Pavel (UFA-U) RID, ORCID
Hellinger, Petr (UFA-U) RID, ORCID
Taylor, M. G. G. T. (NL)
Escoubet, C. P. (NL)
Dandouras, I. (FR)
Lucek, E. (GB)Source Title Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 34, č. 15 (2007), L15104/1-L15104/5Number of pages 5 s. Language eng - English Country US - United States Keywords numerical simulations ; marginal stability ; mirror instability ; proton cyclotron instability ; hybrid simulations Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GA205/05/1011 GA ČR - Czech Science Foundation (CSF) IAA300420602 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) DOI https://doi.org/10.1029/2007GL029728 Annotation We investigate the effect of a slow expansion on a magnetosheath plasma and magnetosheath low-frequency turbulence using a two-dimensional hybrid expanding box simulation. We start our simulation with a high beta plasma almost stable with respect to the mirror and proton cyclotron instabilities. The expansion leads to a continuous decrease of proton beta and drives the increase of the proton temperature anisotropy. Both mirror and proton cyclotron waves appear. The system establishes a marginally stable state with respect to both mirror and proton cyclotron instabilities. During the first phase of the simulation the mirror waves dominate over the proton cyclotron waves, latter, in the low beta region the proton cyclotron waves become dominant. Our results also support the observational possibility of mirror mode waves in plasmas with a negative growth rate (The phenomenon of bistability). We also include an initial comparison with observations made by the Cluster spacecraft. 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 2008
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