A Prominence is an arc of plasma lifted above the Sun’s surface by intense magnetic fields at the very edge of the Sun (the limb) – It appears light (and hot) against the dark background of space. A Filament is exactly the same, but seen over the face of the Sun so that it appears dark (and cold) against the bright, hot photosphere. As the Sun rotates, Proms become filaments. There is a massive “hedgerow” prominence on the Sun’s Eastern limb which is now rotating round to become a filament.
Although it looks as though it is ascending – most hedgerows are descending or “raining out” from the corona down to the chromosphere.
This was a very rushed image taken between clouds. Little time to focus or adjust imaging parameters.
This is the first time I have combined prominence and surface features successfully – settings for my Skyris 274m CCD camera were: Gamma 83; Exposure 1/34s; Gain 176; Contrast 9; Brightness 11, Sharpness 7.
Celestron 1000/102mm refractor
Solarscope DSF 70mm filters
Skyris 274m CCD camera
Ioptron ZEQ25GT mount