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Nonstationarity of a two-dimensional perpendicular shock: Competing mechanisms
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SYSNO ASEP 0323282 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Nonstationarity of a two-dimensional perpendicular shock: Competing mechanisms Title Nestacionarita dvoudimenzionálních kolmých rázových vln: Soupeříci mechanismy Author(s) Lembège, B. (FR)
Savoini, P. (FR)
Hellinger, Petr (UFA-U) RID, ORCID
Trávníček, Pavel M. (UFA-U) RID, ORCIDNumber of authors 4 Source Title Journal of Geophysical Research - ISSN 0148-0227
Roč. 114, A03217 (2009), A03217/1-A03217/21Number of pages 21 s. Publication form web - web Language eng - English Country US - United States Keywords Collisionless shocks ; self-reformation ; nonlinear waves Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects IAA300420702 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) IAA300420602 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000264687100002 DOI 10.1029/2008JA013618 Annotation Two-dimensional PIC simulations are used for analyzing in detail different nonstationary behaviors of a perpendicular supercritical shock. A recent study by Hellinger et al. (2007) has shown that the front of a supercritical shock can be dominated by the emission of large-amplitude whistler waves. These waves inhibit the self-reformation driven by the reflected ions; then, the shock front appears almost quasi-stationary. The present study stresses new complementary results. For a fixed βi value, the whistler waves emission persists for high MA above a critical Mach number. The quasi-stationarity is only apparent and disappears when considering the full 3-D field profiles. For lower MA, the self-reformation is retrieved and becomes dominant as the amplitude of the whistler waves becomes negligible. There exists a transition regime in MA within which both processes compete each other. 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 2009
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