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Abstract
On July 31, 1972, McMath plage 11976 was the site of many moderate-intensity solar radio bursts with unusual radio spectra, emission being limited to only short-centimeter (and possibly millimeter) wavelengths. This same plage region was responsible for the historic solar geophysical events of early August 1972. Unlike most microwave bursts, which have their spectral maximums (ƒmax) in the 2- to 10-GHz range, these July 31 bursts had their ƒmax at ≳15 GHz with extremely steep slopes (≥5) on the low-frequency side of ƒmax and cutoff frequencies generally at ≳10 GHz. Most of the July 31 bursts observed were impulsive, with time profiles similar to those of the X ray emission in the 7.5- to 15-keV and 15- to 30-keV ranges. From the radio spectral characteristics a number of concepts concerning conditions within the burst region are considered and found to present difficulties. Some general conclusions on the burst region properties are reached.
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