MHD waves in the solar north polar coronal hole


ASTRONOMISCHE NACHRICHTEN, vol.331, no.7, pp.716-724, 2010 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 331 Issue: 7
  • Publication Date: 2010
  • Doi Number: 10.1002/asna.200911359
  • Page Numbers: pp.716-724


The effects, hitherto not treated, of the temperature and the number density gradients, both in the parallel and the perpendicular direction to the magnetic field, of O VI ions, on the MHD wave propagation characteristics in the solar North Polar Coronal Hole are investigated. We investigate the magnetosonic wave propagation in a resistive MHD regime where only the thermal conduction is taken into account. Heat conduction across the magnetic field is treated in a non-classical approach wherein the heat is assumed to be conducted by the plasma waves emitted by ions and absorbed at a distance from the source by other ions. Anisotropic temperature and the number density distributions of O VI ions revealed the chaotic nature of MHD standing wave, especially near the plume/interplume lane borders. Attenuation length scales of the fast mode is shown not to be smoothly varying function of the radial distance from the Sun. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim