IRIS Movie of the Day
At least once a week a movie of the Sun taken by NASA's Interface Region Imaging Spectrograph (IRIS) is posted by one of the scientists operating the instrument.
Solar prominence and its bubble
Credit: IRIS, LMSAL/NASA, Milan Gosic
On 02-August-2019 IRIS observed a prominence on the east limb, together with formation of a small prominence bubble. Prominences are cool and dense ionized gas surrounded by a million Kelvin hot coronal plasma. Sometimes large and dark voids or cavities (called prominence bubbles) are formed due to emerging flux beneath the preexisting prominences. Eventually, these bubbles become unstable and transform into one or more plumes.