One dimensional aperture synthesis observations at 2.8 cm of the brightness distribution over the solar equator

The brightness distribution of the equatorial region of the Sun has been investigated at 2.8 cm with an east-west resolution of 16.1 secs of arc for the following days: 30 June, 1 July, 3 July and 4 July, 1972. The results confirm the existence of very intense cores inside active regions with typical sizes of the order of 10-30 secs of arc and brightness temperatures in the range of 105 K with possible peaks up to 6x106 K. The relationship of these features to the Hα structure is also discussed. (Auth.)