Downwelling vector irradiance as energy standard deviation of electromagnetic radiation (longwave) in the atmosphere by pyrgeometer SD_LWRad The square root of the average of the squares of deviations about the mean of a set of values of the specified measurement. 2019-06-04 17:32:45.0 SDN:P01::LWRDSD01 SDN:P01::LWRDSD01 SDN:P01::LWRDSD01 4 4 2019-06-04 17:32:45.0 accepted false