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This reference about the flow of material on the sun explains that the surface of the sun is in constant motion due to the presence of several velocity components that include rotation, cellular convection, oscillations, and meridional flow. The largest velocity signal is that due to solar rotation with an equatorial velocity of 2000 meters per second. In addition there is information about the observations of solar velocity data available from the Global Oscillation Network Group (GONG) instruments and the Michelson Doppler Imager (MDI) on the Solar and Heliospheric Observatory (SOHO) Mission. The site also contains links to other images, most of which confirm the supergranulation convection pattern. The site is enhanced by two images, one showing a Doppler image and the other depicting supergranulation.
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