https://www.pnnl.gov/atmospheric-radiation-measurement-user-facility
The Atmospheric Radiation Measurement (ARM) user facility is a key contributor to national and international atmospheric and climate research efforts.
radiation measurementatmosphericuserfacilitypnnl
https://www.dlr.de/en/sf/multimedia/images/the-pyranocam-radiation-measurement-system
The radiation measurement system consists of a pyranometer and a cloud camera.
radiation measurementsystem