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Proton heating by pick-up ion driven cyclotron waves in the outer heliosphere: Hybrid expanding box simulations
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SYSNO ASEP 0472216 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Proton heating by pick-up ion driven cyclotron waves in the outer heliosphere: Hybrid expanding box simulations Author(s) Hellinger, Petr (UFA-U) RID, ORCID
Trávníček, P. M. (CZ)Number of authors 2 Article number 32 Source Title Astrophysical Journal - ISSN 0004-637X
Roč. 832, č. 1 (2016)Number of pages 7 s. Language eng - English Country US - United States Keywords solar wind ; instabilities ; plasmas Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Institutional support UFA-U - RVO:68378289 UT WOS 000388603600014 EID SCOPUS 84996490263 DOI https://doi.org/10.3847/0004-637X/832/1/32 Annotation Using a one-dimensional hybrid expanding box model, we investigate properties of the solar wind in the outer heliosphere. We assume a proton-electron plasma with a strictly transverse ambient magnetic field and, aside from the expansion, we take into account the influence of a continuous injection of cold pick-up protons through the charge-exchange process between the solar wind protons and hydrogen of interstellar origin. The injected cold pick-up protons form a ring distribution function, which rapidly becomes unstable, and generate Alfven cyclotron waves. The Alfvwn cyclotron waves scatter pick-up protons to a spherical shell distribution function that thickens over that time owing to the expansion-driven cooling. The Alfvwn cyclotron waves heat solar wind protons in the perpendicular direction (with respect to the ambient magnetic field) through cyclotron resonance. At later times, the Alfven cyclotron waves become parametrically unstable and the generated ion-acoustic waves heat protons in the parallel direction through Landau resonance. The resulting heating of the solar wind protons is efficient on the expansion timescale. 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 2017
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