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Photometrical analysis of the June 30, 1973 solar corona
In order to deduce reliable values of the K and F coronal, a method ofphotographic photometry has been applied to study compensatedhigh-resolution pictures obtained during the June 30, 1973, solar totaleclipse, including a color one. The correctly exposed images ofcalibration stars are used to obtain intensities in units of the meanbrightness of the sun. An account is made, in both the blue and the redspectral ranges, for the sky background as well as for the coronalaureola effects. The N-polar and E-equatorial regions are shown to berelatively homogeneous; their intensities are especially studied in theradial direction and compared with published values of the K and Fcoronae. No flattening and no color effect are found in the inner part(distance less than 2.5 solar radii) of the F corona.
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