High Resolution Cinematography of the Solar Photosphere

Abstract

A description is given of a new photoheliograph designed for time-lapse cinematography on 35 mm film of any selected portion of a 20 cm solar image. The interval between successive photographs can be varied from 5 to 120 sec. Air-suction devices have been incorporated to suppress bad seeing originating within the telescope. The performance of the telescope is briefly discussed and the advantages of the cinematographic technique indicated. A discussion of the effects of atmospheric seeing is given in order to emphasize the great caution needed in the interpretation of solar photographs.