title: Measurements of the zenith sky brightness and color during the total solar eclipse of 12 november 1966 at Quehua, Bolivia.
abstract: The brightness and the spectral distribution of the zenith sky in the 5300-6600 A region were measured during the eclipse of 12 November 1966 at Quehua, Bolivia. At totality, the brightness at 5600 A was observed to be 8.4 kR/A, three orders of magnitude lower than the 2.2 x 10(4) kR/A for the normal day sky. The spectral distribution is presented here in terms of a single parameter, the effective blackbody temperature for determining the predominance of secondary scattering during midtotality. The effective temperature was observed to change from 9100 degrees K for normal day sky to 11,100 degrees K during totality.
authors.affiliation: Electrical Engineering Department,Northeastern University, Boston, Massachusetts 02115, USA.
authors.forename: B S
authors.initials: BS
authors.lastname: Dandekar