Photometrie photographique de la couronne solaire

✍ Scribed by S. Koutchmy; N. I. Dzubenko; A. T. Nesmjanovich; S. K. Vsekhsvjatsky

• Publisher: Springer
• Year: 1974
• Tongue: English
• Weight: 808 KB
• Volume: 35
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00151959

✦ Synopsis

A series of plates of the solar corona were obtained during the total solar eclipse of July 10th, 1972 near Anadyr (U.S.S.R.) using a standard eclipse coronagraph of Z = 20 cm and F= 300 cm. A neutral radial filter (Figure ) was specially conceived to enable the study of the corona up to 5 R o and also that of the lunar background. The absolute calibration takes into consideration the different components of the recorded radiation: the K and F corona, the sky background Be, the coronal aureola Baur and details of the earthshine on the lunar background. The brightness of the corona (K+F) is given along the N-S and E-W axes and also the total brightness recorded along the tangential directions, at selected radial distances.

The photometry shows that the K corona in 1972 was very heterogeneous and its mean brightness close to that of a corona of maximum activity for r< 2 R| Moreover, the difference of brightness between the equator and the poles for r> 2 R o is about twice larger than in the Van de Hulst' model of the corona of minimum activity. At the north pole, a coronal 'hole' clearly appears.