Accession Number : AD0658826

Title :   ON THE ACCURACY OF CERTAIN APPROXIMATIONS FOR THE CHAPMAN FUNCTION.

Descriptive Note : Environmental Research papers no. 272,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Swider,William , Jr. ; Gardner,Margaret E.

Report Date : AUG 1967

Pagination or Media Count : 16

Abstract : Practical approximations for the Chapman function over the entire range of possible solar zenith angles are considered. The approximations are numerically evaluated for a selected number of parametric values. Comparison with the Chapman function on a percent difference basis is provided. Some practical points regarding geometry are discussed for angles exceeding pi/2. (Author)

Descriptors :   (*SOLAR RADIATION, ATTENUATION), (*SPECIAL FUNCTIONS(MATHEMATICAL), APPROXIMATION(MATHEMATICS)), (*ATMOSPHERES, ATTENUATION), ACCURACY, TRIGONOMETRY, TWILIGHT, GEOMETRY

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE