Estimation of width and inclination of a filament sheet using He II 304 Å observations by STEREO/EUVI

Sanjay Gosain (1) , Brigitte Schmieder (2, 3)

1 Udaipur Solar Observatory
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 Physique solaire

The STEREO mission has been providing stereoscopic view of the filament eruptions in EUV wavelengths. The most extended view during filament eruptions is seen in He II 304 Å observations, as the filament spine appears darker and sharper. The projected filament width appears differently when viewed from different angles by STEREO satellites. Here, we present a method for estimating the width and inclination of the filament sheet using He II 304 Å observations by STEREO-A and B satellites from the two viewpoints. The width of the filament sheet, when measured from its feet to its apex, gives estimate of filament height above the chromosphere.

Domaines: Astrophysique [astro-ph]

Sanjay Gosain, Brigitte Schmieder. Estimation of width and inclination of a filament sheet using He II 304 Å observations by STEREO/EUVI. Annales Geophysicae, 2010, 28, pp.149-153. ⟨10.5194/angeo-28-149-2010⟩. ⟨hal-03784892⟩