Estimation of width and inclination of a filament sheet using He II 304 A observations by STEREO/EUVI
arXiv:1001.3004 · doi:10.5194/angeo-28-149-2010
Abstract
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 Ã 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 Ã 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.
9 pages, 2 figures, in Annales Geophysicae