Accession Number : AD0762451

Title :   A Search for Periodic Structure in Solar 2 CM Microwave Radiation.

Descriptive Note : Master's thesis,

Corporate Author : IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : Sentman,Davis D.

Report Date : MAY 1973

Pagination or Media Count : 88

Abstract : 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)

Descriptors :   (*SOLAR RADIATION, MICROWAVES), CHROMOSPHERE, SOLAR DISTURBANCES, CORRELATION TECHNIQUES, POWER SPECTRA, RADIO ASTRONOMY, EXTRATERRESTRIAL RADIO WAVES, OSCILLATION, THESES

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE