Study of the post-flare loops on 29 July 1973 |
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| Authors: | Z ?vestka H W Dodson-Prince S F Martin O C Mohler R L Moore J T Nolte R D Petrasso |
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| Institution: | (1) Space Research Laboratory, Utrecht, The Netherlands;(2) Center for Astrophysics and Space Science, University of California, San Diego, La Jolla, U.S.A.;(3) McMath-Hulbert Observatory, University of Michigan, Michigan, U.S.A.;(4) San Fernando Observatory of California State University, Northridge, U.S.A.;(5) Big Bear Solar Observatory, Caltech, California, U.S.A.;(6) American Science and Engineering, Inc., Cambridge, Mass., U.S.A. |
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| Abstract: | We present revised values of temperature and density for the flare loops of 29 July 1973 and compare the revised parameters with those obtained aboard the SMM for the two-ribbon flare of 21 May 1980. The 21 May flare occurred in a developed sunspot group; the 29 July event was a spotless two-ribbon flare. We find that the loops in the spotless flare extended higher (by a factor of 1.4–2.2), were less dense (by a factor of 5 or more in the first hour of development), were generally hotter, and the whole loop system decayed much slower than in the spotted flare (i.e. staying at higher temperature for a longer time). We also align the hot X-ray loops of the 29 July flare with the bright H ribbons and show that the H emission is brightest at the places where the spatial density of the hot elementary loops is enhanced.presently at Big Bear Solar Observatory, Caltech, California, U.S.A.presently at The Marshall Space Flight Center, Huntsville, Alabama, U.S.A. |
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