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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 0481888 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. (IT)
Hellinger, Petr (ASU-R) 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. 223-224 Number of pages 2 s. Publication form Print - P 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 Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) CEZ AV0Z10030501 - ASU-R (2005-2011) UT WOS 000281438100053 DOI https://doi.org/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. The resulting proton distribution functions are reasonable agreement with those observed in situ. Workplace Astronomical Institute Contact Anežka Melichárková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2018
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