A Search for Periodic Structure in Solar 2 CM Microwave Radiation.
IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
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Two hundred and eighty-five hours of solar data obtained from the University of Iowa 2 cm radiometer during 1968-1969 were analyzed for evidence of the 5 min periodic chromospheric oscillations. A small shift in power from low to higher frequencies in the power spectrum of the 2 cm data was found to be correlated with H alpha and x-ray activity. A statistical analysis of previous works reporting evidence for the oscillations at microwave frequencies indicates that confidence in these previous results is marginal. A model for chromospheric oscillation bursts in quiescent supergranules deduced from Bhattacharyya 1972 is presented. Modified author abstract