2.7.2 spase://NOAA/Instrument/GOES/18/EXIS NOAA Instrument Extreme Ultraviolet and X-Ray Irradiance Sensors EXIS 2026-09-17T00:08:46Z The Extreme Ultraviolet and X-Ray Irradiance Sensors (EXIS) is a suite of solar irradiance sensors on the GOES-18 spacecraft. EXIS measures solar irradiance at extreme ultraviolet and soft X-ray wavelengths for monitoring solar activity and its effects on the Earth's upper atmosphere. EXIS consists of two primary instruments: the Extreme Ultraviolet Sensor (EUVS) and the X-Ray Sensor (XRS). EUVS measures solar spectral irradiance at selected extreme ultraviolet and far ultraviolet wavelengths, while XRS measures broadband solar soft X-ray irradiance. EXIS is mounted on the Sun-Pointing Platform of the GOES-18 spacecraft and provides observations used for solar flare monitoring and for characterizing variations in solar irradiance that affect the ionosphere and thermosphere. spase://SMWG/Person/NOAA.GOES-R.EXIS GeneralContact spase://SMWG/Person/Janet.L.Machol InstrumentScientist GOES-R Extreme Ultraviolet and X-Ray Irradiance Sensors (EXIS) https://www.ncei.noaa.gov/products/goes-r-extreme-ultraviolet-xray-irradiance NOAA NCEI information, documentation, and data access for the GOES-R Extreme Ultraviolet and X-Ray Irradiance Sensors (EXIS) Photometer Spectrometer Extreme Ultraviolet and X-Ray Irradiance Sensors (EXIS) spase://NOAA/Observatory/GOES/18 Sun Sun.Chromosphere Sun.TransitionRegion Sun.Corona