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Observations of coronal polarization at the solar eclipse of 7 March, 1970

✍ Scribed by J. Dürst

Publisher
Springer
Year
1976
Tongue
English
Weight
346 KB
Volume
50
Category
Article
ISSN
0038-0938

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✦ Synopsis

Polarigraphic observations of the 7 March, 1970 eclipse were made at Miahuatlfin (Mexico) with a camera of 120 cm focal length. A polarizing filter in front of the objective could be adjusted at 8 different positions, 22.5 ~ apart. Reduction of eight photographs of the white light corona yields polarization at 72 position angles and from r = 1.1 up to 2.1. High polarization which cannot be explained with Thomson scattering was not observed. An analysation of the measuring accuracy shows, that it is not possible to determine exactly the direction of polarization in the outer corona with the classical method of measuring polarization with a small number of photographs. The coronal hole in the south-west quadrant is analysed. The low intensity and polarization can be explained by a hole with an extent in longitude between 1 and 2 times its extent in latitude and with a minimum electron density between 0 and 0.3 of that outside the hole.

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