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.
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7 Mar 2018
Waterfall prominence
Credit: IRIS, LMSAL/NASA, Jean-Pierre Wuelser
Did you know that solar physicists sometimes use more than one name to refer to the same thing? That's the case for filaments (dark bands of material lying over the Sun's surface) and prominences (bright material hanging over the Sun's edge), which turn out to be the same thing but viewed from different angles! This prominence, viewed in ultraviolet light produced by magnesium in the Sun's atmosphere, exhibits long flows that from this angle resembles a waterfall hanging off the disk of the Sun.