Solar Radio-Noise of 200 Mc./s. and its Relation to Solar Observations

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Abstract
The solar radio-noise observing programme on Mount Stromlo is described. Daily means of ( a ) steady flux, and ( b ) number of bursts per hour have been plotted against sunspot and geomagnetic data. Both flux level and burst frequency increase during a solar radio-noise storm, and both are closely related to the central meridian passage of sunspots. However, some large sunspot groups do not produce solar noise. No close relation has been found between the emission from the Sun of ( a ) radio-noise, and ( b ) those particles which produce geomagnetic storms. No close correlation has been found between short period radio-noise phenomena and solar observations, but there are occasional outbursts of solar noise accompanying the commencements of flares. It is suggested that the noise source is located rather high in the corona. The observation of a noise outburst caused by a flare 37° from the main spot group can be explained if the source is more than 120,000 km. above the Sun's surface. Physical arguments lead to a similar height.

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