Articles | Volume 28, issue 1
Ann. Geophys., 28, 149–153, 2010
https://doi.org/10.5194/angeo-28-149-2010

Special issue: Three eyes on the Sun – multi-spacecraft studies of...

Ann. Geophys., 28, 149–153, 2010
https://doi.org/10.5194/angeo-28-149-2010

  18 Jan 2010

18 Jan 2010

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

S. Gosain1 and B. Schmieder2 S. Gosain and B. Schmieder
  • 1Udaipur Solar Observatory, P.O. Box 198, Dewali, Udaipur 313001, India
  • 2Observatoire de Paris, LESIA, 92190 Meudon, France

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 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.