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On the role of wave-particle interactions in the evolution of solar wind ion distribution functions
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SYSNO ASEP 0355922 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title On the role of wave-particle interactions in the evolution of solar wind ion distribution functions Author(s) Matteini, L. (FR)
Landi, S. (IT)
Velli, M. (US)
Hellinger, Petr (UFA-U) RID, ORCIDSource Title Twelfth International Solar Wind Conference. Proceedings Paper. - New York : Melville, 2010 / Maksimovic M. ; Issautier K. ; Meyer-Vernet N. ; Moncuquet M. ; Pantellini F. - ISSN 0094-243X - ISBN 978-0-7354-0759-6 Pages s. 223-226 Number of pages 4 s. Action International Solar Wind Conference /12./ Event date 21.06.2009-26.06.2009 VEvent location Saint-Milo Country FR - France Event type WRD Language eng - English Country US - United States Keywords Solar Wind ; Plasma Simulations ; Kinetic Physics ; Wave-Particle Interactions Subject RIV BL - Plasma and Gas Discharge Physics CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000281438100053 EID SCOPUS 77952033539 DOI 10.1063/1.3396299 Annotation We investigate the role of kinetic effects in the solar wind expansion using 1-D numerical hybrid simulations. The analysis of proton distribution functions in the solar wind shows a non-adiabatic evolution and suggests that several kinetic processes are at work during the expansion. From simulation studies wave-particle and wave-wave interactions, as cyclotron heating and non-linear trapping due to parametric instabilities, are found to play an important role on constraining the proton temperature anisotropy and generating secondary velocity beams. We report results from hybrid comoving simulations that self-consistently retain and describe these processes. We find that cyclotron interactions control the evolution of the proton temperature anisotropy with distance providing a perpendicular heating which contrasts the adiabatic cooling caused by the expansion. At the same time ion-acoustic modes driven by parametric effects produce a velocity beam in the proton distribution function. 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 2011
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