EDP Sciences
Free access
Volume 463, Number 3, March I 2007
Page(s) 1165 - 1170
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20065956

A&A 463, 1165-1170 (2007)
DOI: 10.1051/0004-6361:20065956

High-frequency waves in solar and stellar coronae

V. G. Ledenev1, V. V. Tirsky2, and V. M. Tomozov1

1  Institute of Solar-Terrestrial Physics, Russian Academy of Sciences, PO Box 4026, Irkutsk, Russia
    e-mail: leden@iszf.irk.ru
2  Institute of Laser Physics, Russian Academy of Sciences, Irkutsk Branch, Russia

(Received 3 July 2006 / Accepted 15 November 2006)

On the basis of a numerical solution of dispersion equation we analyze characteristics of low-damping high-frequency waves in hot magnetized solar and stellar coronal plasmas in conditions when the electron gyrofrequency is equal or higher than the electron plasma frequency. It is shown that branches that correspond to Z-mode and ordinary waves approach each other when the magnetic field increases and become practically indistinguishable in a broad region of frequencies at all angles between the wave vector and the magnetic field. At angles between the wave vector and the magnetic field close to $90\degr$, a wave branch with an anomalous dispersion may occur. On the basis of the obtained results we suggest a new interpretation of such events in solar and stellar radio emission as broadband pulsations and spikes.

Key words: plasmas -- turbulence -- radiation mechanisms: non-thermal -- Sun: flares -- Sun: radio radiation -- stars: flare

© ESO 2007

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.