SAA

South Atlantic Anomaly

SAMPEX

Solar Anomalous Magnetospheric Particle Explorer (NASA research satellite)

SEC

Space Environment Center (NOAA)

SEE

Space Environment Effects program at MSFC

SOHO

Solar and Heliospheric Observatory (ESA/NASA research satellite)

SPAN

Solar Particle Alert Network

SPE

solar particle event

SRAG

Space Radiation Analysis Group (at Johnson Space Center)

Sv

sievert (unit of radiation)

SWOP

Space Weather Operations Center (at NOAA's SEC)

STEREO

Solar Terrestrial Relations Observatory (NASA research spacecraft)

SXI

Solar X-ray Imager


TCEP

tissue-equivalent proportional counter


USAF

United States Air Force



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