Photometry and structure of the solar corona during the solar eclipse of July 31, 1981

The observational material taken by the Abastumani Astrophysical Observatory expedition at the total solar eclipse of July 31, 1981 has been used for the structural and photometric investigation of the corona. The photometry of the corona is made by the equidensity method. The intensities are expressed in absolute units. The structural peculiarities of the corona are described. The geometric shape and photometric data permit to assign the corona to the solar activity maximum type.