A strand of relatively cool (about 10,000 K) gas in the solar coronaseen as a bright structure above the Sun's limb against the blackness of space. When the same feature is seen dark in projection against the solar disk it is called a filament. Prominences come in two broad classes: active and quiescent(including quiet region filaments and active region filaments). An active prominence changes in appearance over a few minutes and involves high-speed material motion of up to 2,000 km/s. Active prominences are associated withsunspots and solar flares, can last up to several hours, and take the form of loop prominences, sprays, and surges. Cooler material flowing back from prominences may be seen as coronal rain.LUNT LS60THa/B600/LS50FHa DS
DMK31AU03.AS at f/25
NEQ6 PRO
DMK31AU03.AS at f/25
NEQ6 PRO
2010-11-19
ATHENS
Greece
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