The lone active region visible on our sun put on a fine display with its tangled magnetic field lines swaying and twisting above it … when viewed in a wavelength of extreme ultraviolet light. The charged particles spinning along these field lines illuminate them.
Bottom line: NASA SDO video shows the sun’s only visible active region putting on a fine display, viewed in extreme ultraviolet light, between April 24-26, 2018.
Eleanor Imster has helped write and edit EarthSky since 1995. She was an integral part of the award-winning EarthSky radio series almost since it began until it ended in 2013. Today, as an EarthSky.org Editor, she helps present the science and nature stories and photos you enjoy. She and her husband live in Tennessee, where they enjoy guitar playing and singing. They have 2 grown sons.