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

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