Abstract

On the longitude of Scandinavia the dayside auroral emissions within the polar cleft can be measured continuously in midwinter. The intensity of the Rayleigh scattered sunlight is measured to be about 100 R/Å at 4860 Å when the solar depression angle is 10° and increases rapidly with decreasing solar depression angle. The effect of scattering vanishes around 14° solar depression angle, and the intensity of the sky background can be as low as 2 R/Å or 3 R/Å. Absolute measurements of auroral emissions for smaller so depression angles than 14° require separate observations of the sky background.

© 1978 Optical Society of America

Sky radiance during a total solar eclipse: a theoretical model

Glenn E. Shaw
Appl. Opt. 17(2) 272-276 (1978)

Zenith sky brightness and airglow emissions during the equatorial solar eclipse of 30 June 1973

E. H. Carman, N. J. Skinner, and M. P. Heeran
Appl. Opt. 20(5) 778-785 (1981)

Monte Carlo Studies of the Sky Radiation at Twilight

Wolfram G. Blättner, Henry G. Horak, Dave G. Collins, and Michael B. Wells
Appl. Opt. 13(3) 534-547 (1974)

Sky Brightness and Polarization During the 1973 African Eclipse

Glenn E. Shaw
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Instrument for the monochromatic observation of all sky auroral images

S. B. Mende, R. H. Eather, and E. K. Aamodt
Appl. Opt. 16(6) 1691-1700 (1977)