Hard X-ray Flare in the Corona

Hard X-ray Flare in the Corona

. White contour maps show three impulsive hard X-ray sources from high-energy electrons accelerated during a solar flare, superposed on the loop-like configuration of soft X-rays emitted during the flare gradual or decay phase. In addition to the double-footpoint sources, a hard X-ray source exists in the low corona above the corresponding soft X-ray magnetic loop structure, with an intensity variation similar to those of the other two hard X-ray sources. This indicates that the flare is energized from a site near the loop top. These simultaneous images were taken on 13 January 1992 with the Hard X-ray Telescope (HXT) and the Soft X-ray Telescope (SXT) aboard the Yohkoh satellite. (Courtesy of Satoshi Masuda, 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