Hydrogen-Alpha Chromosphere

Hydrogen-Alpha Chromosphere

. This photograph of the Sunís chromosphere was made by tuning into the red line of atomic hydrogen, at the hydrogen-alpha line with a wavelength of 656.3 nanometers. Two round, dark sunspots, each about the size of the Earth, are present in the right half of this image, together with bright plage that marks highly-magnetized regions. (Courtesy of Victor Gaizauskas, obtained at the Ottawa River Solar Observatory, a facility operated by the Herzberg Institute of Astrophysics for the National Research Council of Canada.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University