Supergranulation

Supergranulation

. This velocity image, or Dopplergram, of the Sunís photosphere, with rotational motion removed, shows motion toward and away from the observer as light and dark patches. The velocity field is made up of about 2,500 supergranules, each about 35 million meters across. Near the disk center they are hardly visible at all, thus indicating that the velocities are predominantly horizontal. (Courtesy of the SOHO MDI/SOI consortium. SOHO is a project of international cooperation between ESA and NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University