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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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    0472216 - ÚFA 2017 RIV US eng J - Journal Article
    Hellinger, Petr - Trávníček, P. M.
    Proton heating by pick-up ion driven cyclotron waves in the outer heliosphere: Hybrid expanding box simulations.
    Astrophysical Journal. Roč. 832, č. 1 (2016), č. článku 32. ISSN 0004-637X. E-ISSN 1538-4357
    Institutional support: RVO:68378289
    Keywords : solar wind * instabilities * plasmas
    OECD category: Fluids and plasma physics (including surface physics)
    Impact factor: 5.533, year: 2016
    http://iopscience.iop.org/article/10.3847/0004-637X/832/1/32/pdf

    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.
    Permanent Link: http://hdl.handle.net/11104/0269645

     
     
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