The Sun in the Light of Hydrogen Atoms

The Sun in the Light of Hydrogen Atoms

. This global image of the Sun was taken in the light of hydrogen atoms, at the red hydrogen-alpha transition with a wavelength of 656.3 nanometers, on 11 August 1980. Small, dark regions above sunspots, bright active regions and plage, and dark string-like filaments are seen on the visible disk; bright prominences extend outward over the disk edge or limb. (Courtesy of the Space Environment Center, National Oceanic and Atmospheric Administration (NOAA) under partial support from the United States Air Force.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University