Published by
EDP Sciences
EDP Sciences Journals List
Subscriber Authentication Point
Home All issues Volume 465/ 2 Article
Free access
Issue A&A
Volume 465, Number 2, April II 2007
Page(s) 603 - 612
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20065845



A&A 465, 603-612 (2007)
DOI: 10.1051/0004-6361:20065845

Stationary parts of an EIT and Moreton wave: a topological model

C. Delannée1, J.-F. Hochedez1, and G. Aulanier2

1  Royal Observatory of Belgium, Brussels, Belgium
    e-mail: ceaulanier@wanadoo.fr
2  LESIA, Meudon observatory, Meudon, France

(Received 16 June 2006 / Accepted 30 August 2006)

Abstract
Context.EIT and Moreton waves came into focus in 1997, when a propagating disturbance on a large area of the solar disc was discovered. The process generating the EIT and Moreton waves has been frequently discussed.
Aims.On May 2, 1998, a halo CME was observed related to an EIT wave, a Moreton wave, a X1 flare, radio emission sources, and dimmings. We studied this event to find the relation between all these structures.
Methods.We use and co-align multi-wavelength observations and the online potential field source surface (pfss) package.
Results.The observed EIT and Moreton waves present some brightenings that remain at the same location. We relate the connectivity of the coronal potential magnetic field to the stationary brightenings. We find that the areas where the magnetic field lines have drastic jumps of connectivity are cospatial to the stationary brightenings of the waves.
Conclusions.We conclude that the EIT and Moreton waves may be due to Joule heating resulting from the generation of electric currents in the neighboring area of the drastic jumps of magnetic connectivity, while the magnetic field lines are opening during a CME.


Key words: Sun: coronal mass ejections (CMEs) -- Sun: magnetic fields -- Sun: activity -- Sun: flares -- Sun: chromosphere -- Sun: corona



© 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.