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Proton core-beam system in the expanding solar wind: Hybrid simulations

  1. 1. 0373443 - UFA-U 2012 RIV US eng J - Journal Article
    Hellinger, Petr - Trávníček, Pavel M.
    Proton core-beam system in the expanding solar wind: Hybrid simulations.
    Journal of Geophysical Research. Roč. 116, A11 (2011), A11101/1-A11101/13 ISSN 0148-0227
    R&D Projects: GA AV ČR IAA300420702
    Grant - others:European Space Agency(XE) PECS contract No. 98068; European Commissions(XE) SWIFF (project 263340)
    Institutional research plan: CEZ:AV0Z30420517; CEZ:AV0Z10030501
    Keywords : ELECTROMAGNETIC PROTON/PROTON INSTABILITIES * VELOCITY SPACE DIFFUSION * WAVE-WAVE SCATTERING * TEMPERATURE ANISOTROPY * PLASMA * DRIFT * DISTRIBUTIONS
    Subject RIV: BL - Plasma and Gas Discharge Physics
    Impact factor: 3.021, year: 2011
    http://www.agu.org/pubs/crossref/2011/2011JA016940.shtml

    Results of a two-dimensional hybrid expanding box simulation of a proton beam-core system in the solar wind are presented. The expansion with a strictly radial magnetic field leads to a decrease of the ratio between the proton perpendicular and parallel temperatures as well as to an increase of the ratio between the beam-core differential velocity and the local Alfven velocity creating a free energy for many different instabilities. The system is indeed most of the time marginally stable with respect to the parallel magnetosonic, oblique Alfven, proton cyclotron and parallel fire hose instabilities which determine the system evolution counteracting some effects of the expansion and interacting with each other. Nonlinear evolution of these instabilities leads to large modifications of the proton velocity distribution function. The beam and core protons are slowed with respect to each other and heated, and at later stages of the evolution the two populations are not clearly distinguishable.
    Permanent Link: http://hdl.handle.net/11104/0206542