Use of Radio Data to Determine the Position of the Region in Which the Characteristics of the Solar Atmosphere Change Rapidly

摘要

The radio radius of the sun r sub 1 (relative to the results of the photosphere r sub 2) is determined from radio observations of solar eclipses by finding the difference between the moments of contact of the lunar and solar disks recorded by radio and optical methods. This involves observations of the second and third contacts, near which the occulted area of the solar disk changes much more rapidly and r sub 2 can be determined much more precisely than when the first and fourth contacts are used. The data of several solar eclipses were used to determine r sub 1.