The solar prominence is viewed in profile from Stereo Ahead (which did not photograph the whole star), while the filament is shown as a dark patch from Stereo BehindFrom The Daily Mail:
Dramatic eruptions on the Sun have been captured in rare footage by two Nasa spacecraft.
Filmed over two days, the images show large glowing clouds of gas bursting from the Sun's surface and held aloft by the star's twisted magnetic fields.
These huge solar prominences are several times larger than the Earth and are caused by the solar activity cycle. It is one of the most spectacular events that the twin STEREO (Solar TErrestrial RElations Observatory) craft have observed.
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