NOAA Space Environment Monitor (SEM) Science-Quality Particle Data from GOES 13-15

The Space Environment Monitor (SEM) instruments onboard GOES 13-15 have four Energetic Particle Sensors, which include SEM/HEPAD (High Energy Proton and Alpha Particles Detector), SEM/EPEAD (Energetic Proton, Electron and Alpha Detector), SEM/MAGED (Magnetospheric Electron Detector), and SEM/MAGPD (Magnetospheric Proton Detector). These sensors measure proton, alpha-particle, and electron fluxes at geosynchronous orbit. The v1 processing includes operational data from GOES 13-15. The v2 processing includes data processed from GOES 14 ‘storage mode’ observations to fill gaps in the operational period of record. Note: Longitudinal variations in magnetospheric particle fluxes make the GOES-East and GOES-West particle data not representative in general of the fluxes present at the storage location (105 degrees West). At this location, GOES 14 is magnetically conjugate to a region of Canada west of Hudson Bay that is well instrumented with magnetometers and all-sky auroral imagers. This data collection includes Level-1b and L2 SEM-HEPAD/EPEAD/MAGED/MAGPD data from GOES 14. The data were produced from ‘storage mode’ observations acquired from May 23, 2013 to November 30, 2017. The data include the following science-quality enhancements: more accurate time stamps, a saturation flag for MAGED and MAGPD data, and the removal of several artificial data spikes. 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).