Accession Number : AD0428447


Title :   EVALUATION OF LIMB DARKENING FROM TIROS III RADIATION DATA,


Corporate Author : CHICAGO UNIV ILL


Personal Author(s) : Larsen,S H H ; Fujita,T ; Fletcher,W L


Report Date : Aug 1963


Pagination or Media Count : 19


Abstract : Detailed analyses of radiation data over the Sahara desert, using analog traces (brush records) of the medium resolution, five-channel radiometer on TIROS III, were made in an attempt to evaluate the limb darkening (variation in intensity of outgoing radiation with the direction of propagation). In the technique employed use was made of the fact that some areas on the earth are scanned twice by the radiometer beam within a few minutes interval as the satellite spins and progresses along its path. Pairs of measurements, where the satellite's radiometer views the same point at a large and a small zenith angle, were combined, and from such measurements a substantial limb darkening was found. Serious influences on the radiation data may occur as a consequence of the scan geometry; these have been carefully examined and taken into account in the interpretation of the data. (Author)


Descriptors :   *RADIATION MEASURING INSTRUMENTS , METEOROLOGICAL SATELLITES , ALBEDO(ASTRONOMY) , DESERTS , RADIOMETERS , SCANNING , WEATHER COMMUNICATIONS


Distribution Statement : APPROVED FOR PUBLIC RELEASE