Počet záznamů: 1  

Shock-drift accelerated electrons and n-distribution

  1. 1.
    0463131 - ASU-R 2017 RIV FR eng J - Článek v odborném periodiku
    Vandas, Marek - Karlický, Marian
    Shock-drift accelerated electrons and n-distribution.
    Astronomy & Astrophysics. Roč. 591, July (2016), A127/1-A127/6. E-ISSN 1432-0746
    Grant CEP: GA ČR(CZ) GA14-19376S; GA ČR GA15-17490S; GA ČR GAP209/12/0103
    Grant ostatní:EC(XE) 295272; EC(XE) 606862
    Program:FP7; FP7
    Institucionální podpora: RVO:67985815
    Klíčová slova: shock waves * acceleration of particles * Sun flares
    Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
    Obor OECD: Astronomy (including astrophysics,space science)
    Impakt faktor: 5.014, rok: 2016

    By analyzing soft X-ray spectra observed during the impulsive phase of several solar flares, the n-distribution function of superthermal electrons has been detected. In the paper we try to answer the question of whether electrons with this type of distribution function can be produced in a shock, e.g. in a flare termination shock. We use analytical and numerical methods to compute distribution functions of electrons accelerated by a shock. We analytically derive the distribution functions of reflected electrons at quasi-perpendicular shocks. We also consider the influence of the electrostatic cross-shock potential, shock curvature, and the role of the upstream seed population on these distributions. The computed distributions are compared with the n-distributions. We found that a high-energy part of the distribution of electrons reflected at a quasi-perpendicular shock can be very well fitted by the n-distribution in all the cases we studied. This provides a chance to detect the flare termination shock.
    Trvalý link: http://hdl.handle.net/11104/0262404