Magnetic fields,bremsstrahlung and synchrotron emission in the flare of 24 October 1969 |
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Authors: | H Zirin Gail Pruss Joan Vorpahl |
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Institution: | (1) Big Bear Observatory, Hale Observatories California Institute of Technology, Carnegie Institute of Washington, D.C., U.S.A;(2) Space Sciences Laboratory, University of California, Berkeley, Calif., U.S.A |
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Abstract: | An impulsive flare October 24, 1969 produced two bursts with virtually identical time profiles of 8800 MHz emission and X-rays above 48 keV. The two spikes of hard X-rays correspond in time to the times of sharp brightening and expansion in the H flare. The first burst was not observed at frequencies below 3000 MHz. This cut off is ascribed to plasma cutoff above the low-lying flare.A model of the flare based on H observations at Big Bear shows that the density of electrons with energy above 10 keV is 5 × 107 if the field density is 1011. The observed radio flux would be produced by this electron distribution with the observed field of 200 G. The H emission accompanying the hard electron acceleration is presumed due to excitation of the field atoms by the hard electrons. |
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