Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112..241d&link_type=abstract
Astronomy and Astrophysics, vol. 112, no. 2, Aug. 1982, p. 241-250. Research supported by the Swiss National Science Foundation
Astronomy and Astrophysics
Astrophysics
23
Astronomical Photometry, Polarimetry, Solar Corona, Solar Eclipses, Astronomical Photography, Brightness Distribution, Color Photography, Electron Density Profiles, Sky Brightness, Stellar Color
Scientific paper
Eclipse photographs obtained with a new type of eclipse camera during the solar eclipse of February t6, t980 at Yellapur (India) are analysed, applying special care to relative and absolute calibration and to the coronal aureole. Due to good and stable atmospheric conditions at the observing site, reliable values of coronal intensities, up to r=10 rsun are obtained. Polarization is measured up to r = 3.3 rsun and used to separate K and F corona. The F corona is found to be spherical for r < 2 rsun and to show increasing flattening with distance. No reddening of the F corona is measured for r < 5 rsun. Polarization is in the range explainable by Thomson scattering. Polarization rates of the K corona reveal deviations from a spherical electron density distribution. For regions with spherical density distribution, electron densities are calculated and compared with published models. The integrated flux of the corona (K+F, r=1.03rsun-6 rsun) is 1.29 10-6 solar flux.
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