• IRIS • Supra-arcade Plasma 23.9.2020 This video is made up of 2600 images taken in April 2014 over an 8 hour period by NASA's Interface Region Imaging Spectrograph (IRIS) satellite. In solar physics, an “arcade” refers to a bundle of coronal loops, and the prefix “supra” indicates that the downflows appear above flare arcades. They were first described in 1999 using the Soft X-ray Telescope (SXT) on board the Yohkoh satellite. A flare is seen about 19 seconds in and is resposible for the plasm