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NOAA Space Environment Monitor (SEM) Science-Quality Magnetometer (MAG) Data from GOES 8-15

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: December 19, 2025 | Last Modified: 1994-04-01T00:00:00.000+00:00
The Space Environment Monitor (SEM) Magnetometer (MAG) instrument onboard the GOES satellite series measures the magnitude and direction of the Earth's ambient magnetic field in geosynchronous orbit. This data collection includes Reprocessed Level-1b and Level-2 SEM/MAG data from GOES 8-15. The data are enhanced to science quality from the original operational archive. Enhancements include the highest temporal cadence (2Hz), recomputed means, corrected calibration parameters, updated quality flagging, vector measurements in geophysically relevant coordinates, and full ephemeris information. The data were produced by NOAA’s National Centers for Environmental Information (NCEI) and archived by NOAA's Comprehensive Large Array-Data Stewardship System (CLASS).

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