Flare fragmentation and type III productivity in the 1980 June 27 flare |
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| Authors: | M J Aschwanden A O Benz R A Schwartz R P Lin R M Pelling W Stehling |
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| Institution: | (1) Laboratory for Astronomy and Solar Physics, NASA/Goddard Space Flight Center, 20771 Greenbelt, MD, U.S.A.;(2) Institute of Astronomy, ETH, CH-8092 Zürich, Switzerland;(3) Laboratory for Astronomy and Solar Physics, NASA/Goddard Space Flight Center, 20771 Greenbelt, MD, U.S.A.;(4) Space Sciences Laboratory and Astronomy Department, University of California, Berkeley, U.S.A.;(5) Center for Astrophysics and Space Science, University of California, San Diego, U.S.A.;(6) Institute of Astronomy, ETH, CH-8092 Zürich, Switzerland |
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| Abstract: | We present observations of the solar flare on 1980 June 27, 16:14–16:33 UT, which was observed by a balloon-borne 300 cm2 phoswich hard X-ray detector and by the IKARUS radio spectrometer. This flare shows intense hard X-ray (HXR) emission and an extreme productivity of (at least 754) type III bursts at 200–400 MHz. A linear correlation was found between the type III burst rate and the HXR fluence, with a coefficient of  7.6 × 1027 photons keV–1 per type III burst at 20 keV. The occurrence of 10 type III bursts per second, and also the even higher rate of millisecond spikes, suggests a high degree of fragmentation in the acceleration region. This high quantization of injected beams, assuming the thick-target model, shows up in a linear relationship between hard X-ray fluence and the type III rate, but not as fine structures in the HXR time profile.The generation of a superhot isothermal HXR component in the decay phase of the flare coincides with the fade-out of type III production.Universities Space Research Associates.ST Systems Corporation. |
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