Accession Number : AD0679738

Title :   MEASUREMENT OF THE BRIGHTNESS COEFFICIENT OF THE GROUND AND CLOUDS FROM AN AIRPLANE,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Kostyanoi,I. N. ; Kostyanoi,G. N. ; Pakhomova,L. A.

Report Date : 21 MAY 1968

Pagination or Media Count : 19

Abstract : The reflection ability of a surface is usually characterized by the albedo which is a ratio of the incident light to the light reflected in all directions. The brightness coefficient can be used instead of the albedo. The brightness coefficient for various natural surfaces was determined from aerological and actinometric observation data obtained by airplane flights to a height of 6 km. The downward flow was measured with the help of a pyranometer installed above the aircraft fuselage, and the reflected radiation was measured by a special instrument fastened beneath the airplane. The reflected radiation was measured in absolute units. Flights took place above different ground and cloud areas. Coefficients computed from data obtained above water surfaces were represented graphically.

Descriptors :   (*EARTH(PLANET), REFLECTIVITY), (*BRIGHTNESS, MEASUREMENT), SURFACE PROPERTIES, TERRAIN, CLOUD COVER, WATER, OPTICAL INSTRUMENTS, AIRBORNE, USSR

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE