5.4.3. Measurement of the short-wave radiation balance

For energy balance measurements of foraging honey bees it may be necessary to determine the reflecting ability (albedo) of the ground surface in addition to the direct solar radiation. A combination of a pair of global radiation pyranometers, one directed upwards and the other downwards, allows for measurement of the short-wave radiation balance. The downward directed sensor measures the radiation reflected by the ground. The upward directed sensor measures direct and indirect solar radiation. From the readings of the two pyranometers, the albedo can be calculated.