NISTAR (National Institute of Standards and Technology Advanced Radiometer) employs three electrical substitution radiometers and a photodiode to measure reflected sunlight and infrared emission from the Earth. NISTAR measures the absolute irradiance integrated over the entire sunlit face of Earth in four broadband channels minute-by-minute. These measurements provide an accurate energy balance measurement that improves our understanding of the Earth’s radiation budget.
Learn more: https://epic.gsfc.nasa.gov/about/nistar
- Measurements from NISTAR improve our understanding of the effects of changes to Earth's reflected and emitted radiation caused by human activities and natural phenomena. This information can be used for climate science applications. https://eosweb.larc.nasa.gov/project/dscovr/dscovr_table