H-alpha observations of the August 12, 1975 Type III-RS bursts

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H Alpha Line, Solar Radio Emission, Type 3 Bursts, Filtergrams, Solar Corona, Solar Flares, Stellar Models, Time Response

Scientific paper

We present H-alpha filtergram observations of a number of the Type III-RS (reverse slope) bursts that occurred on August 12, 1975. Solar radio emission was peculiar on that date in that a large number, and proportion, of the usually rare reverse slope bursts were observed (Tarnstrom and Zehntner, 1975). We show that the radio bursts coincide in time with a homologous set of H-alpha flares located at the limbward edge of spot group Mt. Wilson 19598. We propose a model in which the reverse slope bursts are the downward branches of U bursts, whose upward branches are hidden behind the coronal density enhancement over the spot group.

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