SBUV Solar backscatter ultraviolet
SEP Solar energetic particle
SIM Spectral Irradiance Monitor
SOLSTICE Solar Stellar Intercomparison Experiment
SORCE Solar Radiation and Climate Experiment
SPE Solar proton event
Spörer minimum A period of low solar activity lasting from 1460 to 1550 and named after Gustav Spörer
SSI Solar spectral irradiance
SST Sea surface temperature
TIM Total Irradiance Monitor
TSI Total solar irradiance

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