Double, Double, Toil and Trouble

Double, Double, Toil and Trouble

. At high magnification, the photosphere appears completely covered with an irregular, strongly-textured pattern of cells called granules. The hot granules, each 1.5 million meters or smaller across, rise at speeds of 500 meters per second, like supersonic bubbles in a immense, boiling cauldron. The rising granules radiate their energy, and cool material then sinks down along the dark, inter-granular lanes. This photograph was taken at 430.8 nanometers with an 11-nanometer interference filer.; it has an exceptional angular resolution of 0.2 arc-seconds, or 150 thousand meters at the Sun . (Courtesy of Richard Muller and Thierry Roudier, Observatoire du Pic-du-Midi et de Toulouse.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University