Expanding Magnetic Loops in an Active Region

Expanding Magnetic Loops in an Active Region

. Difference images reveal the expansion of active-region loops in a time sequence, running from top to bottom, lasting about one half an hour. The fainter loops near the top are expanding with an apparent velocity of about 40 thousand meters per second. These images were taken on 22 April 1992 with the Soft X-ray Telescope (SXT) on Yohkoh. (Courtesy Alan McAllister, NASA, ISAS, the Lockheed-Martin Solar and Astrophysics Laboratory, the National Astronomical Observatory of Japan, and the University of Tokyo.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University