Distribution of Flares on the Solar Disk Associated with Noise

Physics

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Scientific paper

THE association of solar noise bursts at 48 Mc./s. and solar flares has been examined for the periods June 20-July 31, 1957, September 1-October 1, 1957, and June 1-July 31, 1958. The noise burst data were obtained from the Resolute auroral radar film records. Resolute was the northern station (75° N., 95° W.) of the National Research Council's International Geophysical Year Auroral Radar Chain1. For the purpose of this analysis, bursts are defined as solar radio noise events with durations of the order of 30 seconds or less (probably due to spectral type III bursts). Association with a particular flare was assumed probable if the burst occurred during an interval of 2 minutes preceeding, to 3 minutes following the flare commencement. This is a more stringent requirement than that usually used2,3. During the periods listed above, a total of 535 such events were recorded with 12 per cent of the noise-producing flares occuring within +/- 5° of the central meridian, while for the same periods 8 per cent of all flares occurred in the same interval.

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