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 Feb 2018
An Intriguing Arch Prominence
Credit: IRIS, LMSAL/NASA, Wei Liu
Solar prominences are cool, chromospheric-temperature material suspended in the million-degree hot corona. This prominence, observed by IRIS on 2018-Feb-3 on the southeast solar limb, forms a large arch and a void underneath it. The void appears to be different from a typical prominence bubble that would otherwise have a sharp top boundary like a dome. There are interesting, tumbling flow patterns in the arch, especially at the interface just above the void.