Solar Decimetre Radio Bursts

Abstract

High resolution studies (2' of arc beam) were made with the east·west arm of the Christiansen radio interferometer for about 50 21·cm solar burst events during 1958-1961. The burst sources were always closely associated in position with already existing radio plage regions of the Sun's slowly varying decimetre radiation. They had sizes of from 2 to 5' of arc, never exceeded but often approached in size their parent plage region, and showed no major movements during their development. Brightness temperatures ranged up to 2 X 109 OK (mostly between 107 and 108 OK). More bursts were observed near the Sun's centre than near the limb, and more on the western than on the eastern half. There was also a curious "gap" of 30° longitude on the eastern half of the Sun with virtually no burst activity.