Double Flaring Sources

Double Flaring Sources

. Hard X-ray flares often appear as double sources that are aligned with the photosphere footpoints of a flaring magnetic loop detected at soft X-ray wavelengths. These footpoints can also be the sites of white-light flare emission. The time profiles of this flare, detected on 15 November 1991, show that the increase of white-light emission matches almost exactly that of the hard X-ray flux. This and the simultaneity of hard X-ray emission from the two footpoints establish that non-thermal electrons transport the impulsive-phase energy along the flare loops. These soft X-ray, hard X-ray and white-light images of the solar flare were taken with telescopes aboard the Yohkoh mission. (Courtesy of 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