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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. |