Fig5_6 The solar granulation

Fig5_6 The solar granulation

Fig. 5.6 . Underlying convection shapes the photosphere, producing tiny, varying regions called granules. They are places where hot, and therefore bright, material reaches the visible solar disk. The larges granules are about 1400 km across. They are not circular, but angular in shape. This honeycomb pattern of rising (bright) and falling (dark) gas is in constant turmoil, completely changing on time-scales of minutes and never exactly repeating itself. This image was taken with exceptional angular resolution of 0.2 seconds of arc or 150,000 km at the Sun using the National Solar Observatory’s Vacuum Tower Telescope at the Sacramento Peak Observatory. (Courtesy of Thomas R. Rimmele/AURA/NOAO/NSF.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University