RADIO OBSERVATION OF THE SOLAR ANNULAR ECLIPSE OF SEPTEMBER 23,1987 AT 3.2cm WAVELENGTH

This paper presents the observation results of the solar annular eclipse of Sept. 23, 1987 at 3.2 cm wavelength. The data processing and the identification of S-component sources are also described. The following results are obtained:(1) The radius of the radio sun amounts to 1.09 in solar minimum year.(2) The distribution of the brightness temperature on the solar disk shows that there is an apparent brightness in the 13’4-15’9 range on the optical limb and its peak brightness amounts to 13.5 ± 5%.(3) The flux density of the quiet sun amounts to 264.8sfu.(4) Several observed solar radio sources are associated with sunspots and plages. The following parameters of these sources are obtained: angular sizes, flux densities, average brightness temperatures and heights. Average brightness temperatures of the sources are estimated approximately 3-4×10⁵K and 1.5-1.7×10⁵K respectively. Heights of the sources above the photosphere are 1-2.7 × 10⁴km.