The Sun rotates and changes as it does. Those changes can range from subtle to dramatic. This time-lapse video assembled from Solar Dynamics Observatory data shows the Sun during the entire month of January. The large image shows the solar chromosphere viewed in ultraviolet light. The smaller images show simultaneous views. The one in the upper right shows the more familiar solar photosphere in visible light. The rest of the inset images highlight x-ray emissions by relatively rare iron atoms located at different heights of the corona.
The Sun takes just under a month to rotate completely, rotating most rapidly at the equator. A large and active sunspot region rotates into view just after the video starts. As the video ends, the same large and active sunspot region comes back into view.[youtube http://youtu.be/2WRgXvdasm0]
Video Credit: NASA