First 3-D Stereo from STEREO: EUVI 171 Ångstroms (Full Disk View)
This movie shows the Sun from the two STEREO spacecraft using the 171 Ã…ngstrom filter in the Extreme UltraViolet Imager (EUVI). The 171 filter reveals ionized iron (Fe+8=Fe IX, Fe+9=Fe X) which forms at temperatures above 1.3x106K, and flows along the magnetic field lines of the solar active regions. New active regions come into view as the Sun rotates left to right.