Spectrograph,filtergraph and magnetograph observations of the two-ribbon flare of 29 July, 1973 |
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Authors: | A G Michalitsanos P Kupferman |
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Institution: | (1) Big Bear Solar Observatory, Hale Observatories, Carnegie Institution of Washington, California Institute of Technology, U.S.A. |
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Abstract: | We present high resolution detailed observations of the class 3N two-ribbon flare of 1973, July 29 (McMath 12461), which was associated with the disappearance of a large filament ( disparition brusque ). This flare occurred in a diffuse bipolar magnetic region completely devoid of sunspots, and was further associated with a type IV radio burst and a soft X-ray event. Extensive H filtergraph, spectrograph and magnetograph records during the main phase of the flare suggest that downfalling and streaming material is present on both ribbons for several hours during the H emission enhancement, but only at a small number of points located both on and off the ribbons. We find a poor spatial correspondence between bright emission knots in the H ribbons and the positions of the observed downward motion. We conclude that the model of infall-impact of Hyder (1967a, b) is not consistent with our filtergraph and spectrograph observations.Presently at the University of Michigan, Ann Arbor, Michigan. |
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