User highlight: active region appearing on the Sun’s limb

YouTube and user galaxy387 shared this movie of an active region appearing on the limb of the Sun.

It’s a great example of the complex evolution that an active can undergo in a relatively short amount of time. Studying the evolution of active region loops on the limb cuts right through the loops themselves so you don’t see any of the disk emission along your line of sight, and so removes a potential source of confusion.

Written on July 17, 2011 by jack