. A cross section of the solar interior showing the ray paths
of sound waves (p modes) and gravity waves (g modes). Sound waves produce
oscillations detected in the photosphere, and can be used to determine the
internal properties of the Sun down to about 0.2 of the solar radius. Gravity
waves never reach the photosphere and are instead turned around inside the Sun,
probing its central depths and reaching the core.
Copyright 2010, Professor Kenneth R. Lang, Tufts University