Big filaments becoming prominences
Taken by Giorgio Rizzarelli on October 4, 2014 @
Trieste, Italy
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Details:
These days Sun had a couple of long and very thick filaments near the W limb: from day to day, as Sun rotated, these became prominences. Sun's chromosphere is here presented in unprocessed red color.
For the upper filament the transition was gradual. Resembling a lizard or a famous 6-legged dog, it was impressive in eyepiece. The first day one could see that the light intensity of the prominence part was the same as the one on the filament part, showing that, at least in this case, the dark filament color is an effect of a color optical illusion. Although I enhanced the prominences to reproduce eye's dynamics, the pic reproduced partly the effect. On Oct3 the prominence part appeared brighter, and, the day after, the filament became completely a prominence.
Another long and thick filament is in the bottom part of the pictures, becoming thicker and finally a "bushy" prominence. We have had various such thick filaments or bushy prominences, without sunspots, since August.
In the first image, on Sun border just below center height you can also see the departing of active region 2172-3 which featured a rather big sunspot. In the seqence one can also see, in upper-center, the sunspot couple AR2176.
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