NASA’s Total and Spectral Solar Irradiance Sensor -1 (TSIS-1) operates on the International Space Station. TSIS-1 provides absolute measurements of the total solar irradiance (TSI) and spectral solar irradiance (SSI), important for accurate scientific models of climate change and solar variability. TSIS-1 is comprised of two instruments, the Total Irradiance Monitor (TIM), and the Spectral Irradiance Monitor (SIM).

This repository archives Version 8 (V08) of the TSIS-1 SIM Level 3 (L3) data release, and contains SSI in two cadences, 12-hour and 24-hour. The TSIS-1 SIM L3 V08 data release contains data from 14 March 2018 to 11 November 2022. TSIS-1 SIM data obtained between 19 March 2022 and 19 May 2022 were affected by an anomaly of the sun-pointing sensor (HFSS-B), which offset pointing by ~1 arcminute.The TSIS-1 SIM V08 L3 data release, and later releases, includes a wavelength-dependent correction for this period. See the V08 release notes at https://lasp.colorado.edu/home/tsis/data/ssi-data/sim-ssi-release-notes/ for further details.

Data is archived in ASCII, netCDF, and IDL SAVfile format. See the attached V08 L3 data release notes for further details.