https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf draft 2025-07-25 https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/instruments/667812a0-5663-40dc-8017-184e5235ea70 Air-LUSI Date=2025-09-16 User Id=system System Note=Added broader relation from Air-LUSI [667812a0-5663-40dc-8017-184e5235ea70] to Visible/Infrared Instruments [bdfc139c-c877-4c9d-9e95-0971524d0193] The Airborne Lunar Spectral Irradiance (Air-LUSI) is a spectrometer designed to measure lunar spectral irradiance at the top of the atmosphere on NASA ER-2 aircraft. It was developed through a partnership with NASA and the National Institute of Standards and Technology (NIST) in collaboration with the University of Maryland Baltimore County, the University of Guelph, and the U.S. Geological Survey to improve satellite accuracy through lunar observations. It consists of three components: an IRradiance Instrument Subsystem (IRIS) to measure lunar irradiance, an Autonomous Robotic Telescope Mount Instrument Subsystem (ARTEMIS) to maintain alignment with the moon, and a HIgh-altitude ER-2 Adaption (HERA) subsystem to protect the instrument from extreme cold and low-pressure environments. Air-LUSI operates across the Visible and Near Infrared (VNIR) spectral region (350-1050 nm) with a spectral resolution of 3.7 nm. It provides highly accurate (<1%) measurements of lunar irradiance that are traceable to the International Systems of Units (SI). These measurements help improve uncertainty in lunar irradiance in the exo-atmosphere to establish a lunar calibration model based on the lunar phase and geometry to calibrate satellite observations. 2025-09-16T14:46:52.387Z