Abstract: A small portable albedometer with direct readout of albedo values is described. The instrument is designed for surveying natural fields on foot. It was used on glaciers in Austria and Greenland, not for precision measurements ...

Abstract: A low-cost isotropic light sensor is described consisting of a spherical diffuser connected to a single photodiode by a light conductor. The directional response to light is isotropic to a high degree. The small, lightweight, ...

Abstract: The Directional Radiance Distribution Measurement (DIRAM) device was designed and built to determine the angular distribution of shortwave radiance as a function of height in cloudy and clear-sky conditions at various ...

Abstract: An instrument to measure ultraviolet actinic flux in and outside clouds was constructed and calibrated. Characteristics of the instrument axe: 1) it is equipped with gallium phosphide photodiodes, 2) its isotropic directional ...