Multi wavelength investigation of the eruption of a sigmoidal quiescent filament^*

¹ DASOP-LPSH, Observatoire de Meudon, 92195 Meudon Cedex, France
² Institut d'Astrophysique Spatiale, Université Paris Sud, 91405 Orsay, France

Corresponding author: Ch. Marqué, christophe.marque@obspm.fr

Received: 19 November 2001
Accepted: 18 February 2002

Abstract

We report the first observation of a filament eruption in the metric and decimetric range, where the behavior of the filament can be followed during the event via thermal radio emission diagnostics. The event, occurring on February 28th 2001, involved a quiescent filament in a sigmoid magnetic configuration, whose eruption is triggered by the birth of a small parasitic polarity. Faint radio bursts mark the beginning of the event, which shows the appearance of a brightness temperature depression associated with the filament seen in eit, and its propagation on the disk up to the limb. The event is associated with a halo CME observed with the coronagraphs lasco C2 and C3, which shows a significant spatial and temporal continuity with the radio observations. Finally, static dimmings, similar to what is currently observed in EUV or SXR domains, are also detected in the radio band, around the site of the eruption. Movies of the event are attached to this article.