NOAA Operational GOES 8-15 Space Environment Monitor (SEM) Level 0 Data

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: May 05, 2026 at 10:42 PM | Dataset Last Updated: May 01, 1994 at 12:00 AM

The Space Environment Monitor (SEM) is a suite of instruments onboard the GOES satellite series. The objective of the SEM package is to measure solar radiation in the X-ray and Extreme Ultraviolet (EUV) region, the in-situ magnetic field, and the energetic particle environment at geosynchronous orbit. This collection contains L0 data from GOES 8-12, provided as monthly binary files and L0 data from GOES 13-15, provided as daily binary and ASCII files. The SEM instrument on GOES 8-12 is composed of four sensors: SEM/EPS (Energetic Particle Sensor), SEM/HEPAD (High Energy Proton and Alpha Particles Detector), SEM/MAG (Magnetometer), and SEM/XRS (X-Ray Sensor). The GOES 13-15 SEM suite added these 3 sensors: SEM/EUVS (Extreme Ultraviolet Sensor), SEM/MAGED (Magnetospheric Electron Detector), and SEM/MAGPD (Magnetospheric Proton Detector). On GOES 13-15, the historical EPS sensor was renamed EPEAD (Electron, Proton, and Alpha Detector) and the term EPS now refers to the suite of particle detectors (EPEAD, MAGED, MAGPD). Combined these sensors provide magnetic field, energetic particle, and solar x-ray and EUV data. The magnetometer (MAG) measures the magnitude and direction of the magnetic field. The energetic particle detectors (EPS, HEPAD, EPEAD, MAGED, MAGPD, and MAGED) measure a spectrum of electron, proton, and alpha-particle fluxes caused by solar activity and galactic cosmic rays. The solar x-ray sensor (XRS) measures solar X-ray fluxes for the wavelength bands of 0.05-.4 nm (short channel) and .1 to .8 nm (long channel). The extreme ultraviolet sensor (EUVS) measures the EUV in 5 bands (A-E) spanning wavelengths 5-127 nm. The temporal period of record (POR) for this collection extends from April 1994 to March 2020. The data were produced by the NOAA/NESDIS Office of Satellite and Product Operations (OSPO) and archived by NOAA's Comprehensive Large Array-Data Stewardship System (CLASS). To access this data, contact NCEI for distribution and ordering instructions.

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GOES Space Weather Instruments

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Global Change Master Directory (GCMD) Keywords

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@type	dcat:Dataset
accessLevel	non-public
contactPoint	{ "fn": "NOAA National Centers for Environmental Information", "@type": "vcard:Contact", "hasEmail": "mailto:ncei.info@noaa.gov" }
describedByType	application/octet-steam
description	The Space Environment Monitor (SEM) is a suite of instruments onboard the GOES satellite series. The objective of the SEM package is to measure solar radiation in the X-ray and Extreme Ultraviolet (EUV) region, the in-situ magnetic field, and the energetic particle environment at geosynchronous orbit. This collection contains L0 data from GOES 8-12, provided as monthly binary files and L0 data from GOES 13-15, provided as daily binary and ASCII files. The SEM instrument on GOES 8-12 is composed of four sensors: SEM/EPS (Energetic Particle Sensor), SEM/HEPAD (High Energy Proton and Alpha Particles Detector), SEM/MAG (Magnetometer), and SEM/XRS (X-Ray Sensor). The GOES 13-15 SEM suite added these 3 sensors: SEM/EUVS (Extreme Ultraviolet Sensor), SEM/MAGED (Magnetospheric Electron Detector), and SEM/MAGPD (Magnetospheric Proton Detector). On GOES 13-15, the historical EPS sensor was renamed EPEAD (Electron, Proton, and Alpha Detector) and the term EPS now refers to the suite of particle detectors (EPEAD, MAGED, MAGPD). Combined these sensors provide magnetic field, energetic particle, and solar x-ray and EUV data. The magnetometer (MAG) measures the magnitude and direction of the magnetic field. The energetic particle detectors (EPS, HEPAD, EPEAD, MAGED, MAGPD, and MAGED) measure a spectrum of electron, proton, and alpha-particle fluxes caused by solar activity and galactic cosmic rays. The solar x-ray sensor (XRS) measures solar X-ray fluxes for the wavelength bands of 0.05-.4 nm (short channel) and .1 to .8 nm (long channel). The extreme ultraviolet sensor (EUVS) measures the EUV in 5 bands (A-E) spanning wavelengths 5-127 nm. The temporal period of record (POR) for this collection extends from April 1994 to March 2020. The data were produced by the NOAA/NESDIS Office of Satellite and Product Operations (OSPO) and archived by NOAA's Comprehensive Large Array-Data Stewardship System (CLASS). To access this data, contact NCEI for distribution and ordering instructions.
distribution	[ { "@type": "dcat:Distribution", "title": "NCEI Landing Page for This Dataset", "accessURL": "https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ncei.swx:goes_sem-l0/html", "mediaType": "text/html", "description": "Dataset landing page with general information and links to access the data.", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "Contact NCEI", "accessURL": "https://www.ncei.noaa.gov/contact", "mediaType": "text/html", "description": "Contact NCEI for more information and to request access to the archived data. Requests are subject to NCEI order fulfillment constraints.", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "GOES Space Weather Instruments", "accessURL": "https://www.ncei.noaa.gov/products/goes-1-15/space-weather-instruments", "mediaType": "text/html", "description": "GOES Space Weather Instruments web page", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "Global Change Master Directory (GCMD) Keywords", "accessURL": "https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords", "mediaType": "text/html", "description": "The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "NOAA National Centers for Environmental Information (NCEI)", "accessURL": "https://www.ncei.noaa.gov", "mediaType": "text/html", "description": "NCEI home page with information, data access and contact information.", "describedByType": "application/octet-stream" } ]
identifier	https://data.noaa.gov/waf/NOAA/NESDIS/NGDC/STP/Space_Weather/iso/xml/goes_sem-l0.xml
issued	1994-05-01T00:00:00.000+00:00
keyword	[ "EARTH SCIENCE > Solar Physics > Solar Energetic Particles > Electron Flux", "EARTH SCIENCE > Solar Physics > Solar Energetic Particles > Energetic Particles", "EARTH SCIENCE > Solar Physics > Solar Energetic Particles > Particle Flux", "EARTH SCIENCE > Solar Physics > Solar Activity > Solar Events", "EARTH SCIENCE > Solar Physics > Solar Activity > Solar Flares", "EARTH SCIENCE > Sun-earth Interactions > Solar Activity > Solar X-ray Emissions", "EARTH SCIENCE > Spectral/Engineering > X-Ray", "EARTH SCIENCE > Spectral/Engineering > X-Ray > X-Ray Flux", "EARTH SCIENCE > Sun-earth Interactions > Ionosphere/Magnetosphere Dynamics > Magnetic Fields/Magnetic Currents", "EARTH SCIENCE > Sun-earth Interactions > Ionosphere/Magnetosphere Dynamics > Magnetic Fields/Magnetic Currents", "EARTH SCIENCE > Solid Earth > Geomagnetism > Geomagnetic Forecasts", "EARTH SCIENCE > Sun-Earth Interactions > Ionosphere/Magnetosphere Dynamics", "EARTH SCIENCE > Sun-Earth Interactions > Ionosphere/Magnetosphere Dynamics > Geomagnetic Forecasts", "EARTH SCIENCE > Sun-Earth Interactions > Ionosphere/Magnetosphere Dynamics > Geomagnetic Indices", "EARTH SCIENCE > Sun-Earth Interactions > Ionosphere/Magnetosphere Dynamics > Magnetic Fields/Magnetic Currents", "EARTH SCIENCE > Sun-Earth Interactions > Ionosphere/Magnetosphere Dynamics > Magnetic Storms", "GOES-8 > Geostationary Operational Environmental Satellite - 8", "GOES-9 > Geostationary Operational Environmental Satellite - 9", "GOES-10 > Geostationary Operational Environmental Satellite - 10", "GOES-11 > Geostationary Operational Environmental Satellite - 11", "GOES-12 > Geostationary Operational Environmental Satellite - 12", "GOES-13 > Geostationary Operational Environmental Satellite - 13", "GOES-14 > Geostationary Operational Environmental Satellite - 14", "GOES-15> Geostationary Operational Environmental Satellite - 15", "EPEAD > Electron, Proton, and Alpha Detector", "EPS > Energetic Particle Sensor", "EUVS > Extreme Ultraviolet Sensor", "HEPAD > High Energy Proton and Alpha Detector", "MAG > Magnetometer", "MAGED > Magnetospheric Electron Detector", "MAGPD > Magnetospheric Proton Detector", "XRS > X-ray Sensor", "DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce" ]
language	[]
license	https://creativecommons.org/publicdomain/zero/1.0/
modified	1994-05-01T00:00:00.000+00:00
publisher	{ "name": "NOAA National Centers for Environmental Information", "@type": "org:Organization" }
rights	otherRestrictions
temporal	1994-05-01T00:00:00+00:00/2020-03-01T00:00:00+00:00
title	NOAA Operational GOES 8-15 Space Environment Monitor (SEM) Level 0 Data