Chromosphere During Eclipse

Chromosphere During Eclipse

. A reddened protuberance, called a prominence, provide a brief glimpse of the chromosphere during a total eclipse of the Sun on 11 July 1991. The red light is emitted by the abundant hydrogen atoms in the chromosphere at the hydrogen-alpha electron transition with a wavelength of 656.3 nanometers. (Courtesy of Dennis di Cicco, Sky and Telescope.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University