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A filament eruption on 2010 October 21 observed from three differentviewpoints by the Solar Terrestrial Relations Observatory (STEREO) and theSolar Dynamic Observatory (SDO) is analyzed with invoking also data from theSolar and Heliospheric Observatory (SOHO) and the Kanzelhoehe SolarObservatory. The position of the filament just before the eruption at thecentral meridian not far from the center of the solar disk was favorable forphotospheric magnetic field measurements in the area below the filament.Because of this, we were able to calculate with high precision the distributionof the coronal potential magnetic field near the filament. We found that thefilament began to erupt when it approached the height in the corona where themagnetic field decay index was greater than one. We determined also that duringthe initial stage of the eruption the filament moved along the magnetic neutralsurface.

Filament eruption on 2010 October 21 from three viewpoints