Snow, MartinMcClintock, William E.MacHol, Janet L.2026-01-162026-01-162025Snow, M., McClintock, W., Machol, J., Jones, A.R. and Eparvier, F.G., 2025, July. Operational Solar Spectral Irradiance Measurements from the Extreme Ultraviolet Sensor (EUVS) on the GOES-R Series. In IOP Conference Series: Earth and Environmental Science (Vol. 1522, No. 1, p. 012035). IOP Publishing.https://doi.org/10.1088/1755-1315/1522/1/012035https://hdl.handle.net/10566/21731Beginning in early 2017, the first of four Extreme Ultraviolet Sensor (EUVS) instruments began taking solar spectral irradiance measurements from geostationary orbit. The new series of Geostationary Operational Environmental Satellites (GOES) operated by NOAA in the USA makes high-cadence (1 second) measurements of emission from all layers of the solar atmosphere from the photosphere up through the corona. The A channel observes 25.6 (He II), 28.4 (Fe XV), and 30.4 (He II) nm. Channel B measures 117 (C III), 121.5 (Lyman alpha), 133 (C II), and 140 (Si IV) nm, while the C channel measures the Mg II features around 280 nm. The C channel also reports the Mg II core-towing ratio. Channels A and B make 1-second integrations, while the C channel integrates over a 3-second interval. In addition, these individual measurements are combined to create an empirical model spectrum from 5 to 127 nm with a 30-second cadence. In this presentation we will describe the instruments, their calibration, the public data products, and how to retrieve the data from the NOAA web pages.enOperational SolarIrradiance MeasurementsExtreme Ultraviolet SensorGeostationary Operational Environmental Satellites (GOES)ChannelsArticle