Pulsating Sun

Pulsating Sun

. Sound waves inside the Sun cause the visible solar disk to move in and out. This heaving motion can be described as the superposition of literally millions of oscillations, including the one shown here for regions pulsing in (red spots) and out (blue spots). The sound waves, represented here by black lines inside the cutaway section, resonate through the Sun. They are produced by hot gas churning in the convection zone, which lies above the radiative zone and the Sunís core. (Courtesy of John W. Harvey, National Optical Astronomy Observatories, except cross sections.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University