Description

*Note: This dataset version has been superseded by a newer version. It is highly recommended that users access the current version. 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 L1B and L2 data from GOES 1-15 and SMS 1-2. The SEM suite on SMS 1-2 and GOES 1-5 is composed of three sensors: SEM/EPS (Energetic Particle Sensor), SEM/MAG (Magnetometer), and SEM/XRS (X-Ray Sensor). The SEM/HEPAD (High Energy Proton and Alpha Particles Detector) began with GOES 7. 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 July 1974 to March 2020. The L1b products include full-resolution data (cadence varies by sensor/satellite) provided in daily files in FITS and csv formats. The L2 products include monthly averages (1 minute or 5 minute cadence) provided in monthly files in ASCII format. The data were produced by NOAAâs Space Weather Prediction Center (SWPC) and archived by NOAA's Comprehensive Large Array-Data Stewardship System (CLASS). To access this data, contact NCEI for distribution and ordering instructions.

Resources

Name	Format	Description	Link
	0	Contact NCEI for more information and to request access to the archived data. Requests are subject to NCEI order fulfillment constraints.	https://www.ncei.noaa.gov/contact
	0	GOES Space Weather Instruments web page	https://www.ncei.noaa.gov/products/goes-1-15/space-weather-instruments
	0	NCEI home page with information, data access and contact information.	https://www.ncei.noaa.gov
	0	Landing page for the Current Version.	https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ncei.swx:goes_sem-l1b-l2_ncei/html
	0	Dataset landing page with general information and links to access the data.	https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ncei.swx:goes_sem-l1b-l2_swpc/html

GOES Space Environment Monitor (SEM) L1B & L2 data from SWPC, Version 0 (Version Superseded)

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