
%0 Journal Article
%A Slee, OB 
%T Occultations of the Crab Nebula by the Solar Corona in June 1957 and 1958
%J Australian Journal of Physics
%D 1959/06/01
%V 12
%N 2
%P 134-156
%K 
%R https://doi.org/10.1071/PH590134
%U https://www.publish.csiro.au/paper/PH590134 
%X A description is given of some observations of the occultations of the Crab nebula by the solar corona in June 1957 and 1958, obtained with pencil-beam, fan-beam, and interferometer-type instruments. It is shown that the distribution of 85· 5 Mc/s radiation on days when the angular separation is less than 10 solar radii is not consistent with a symmetrical scattering process. Better agreement is obtained by postulating the existence of scattering and regular refraction of comparable magnitude. Certain unexplained features of the pencil-beam distributions indicate that large-scale electron irregularities may be important in the scattering and refraction process. Additional evidence is presented for very short-term changes in the transmission properties of the corona. 
