Data Set


SORCE-SIM TSIS1-SIM Irradiance Calibration Ratio (STICR) V1.1 Public Deposited

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Alternative Title
  • TSIS-1 SIM Recalibration of the SORCE-SIM Absolute Irradiance Scale

    This is version 1.1 (V01.1) of the SORCE-SIM to TSIS-SIM Irradiance Calibration Ratio (STICR). This data product uses the temporal overlap of the Solar Radiation and Climate Experiment (SORCE) and the Total and Spectral Solar Irradiance Sensor (TSIS-1) Spectral Irradiance Monitor (SIM) instruments to create an alternate SORCE-SIM irradiance calibration.

    The STICR is the mean TSIS-SIM/SORCE-SIM irradiance ratio during the temporal overlap between the two missions (on the L3 SORCE-SIM wavelength scale). The STICR, SORCE, and TSIS-1 mean spectra, plus all ancillary data needed to understand how this ratio was determined are contained in this data product. STICR (V01) is used to create V01 of the SORCE-SIM TSIS-1 Adjusted Values (TAV) irradiance data product (

    In simple terms:
    SORCE-SIM V27 (irradiance) * STICR = SORCE-SIM TAV V01 (irradiance).

    STICR and TAV V01 use TSIS-SIM V05 and SORCE-SIM V27 publicly available data releases. The STICR data products are housed at CU Scholar — a collaborative service of the University of Colorado Libraries, and are available in ASCII and IDL SAVE file format at

    The TAV V01 data product appears in ASCII format in two locations:

    1. LASP SORCE website (see:, and
    2. NASA DAAC (see:

    An IDL file reader ( is available which will read the attached ASCII file and return an array of structures whose field names and types are defined in the attached release notes. The attached STICR IDL SAVE file contains all the information in the ASCII file, plus additional information such as the specific days during the SORCE and TSIS-1 temporal overlap which were used in the determination of the STICR.

    Complete details on the STICR creation, and attached data sets are contained in the included release notes.

    V01.1 differs from V1.0 in that the TSIS ground calibration error estimate has been removed from the TSIS_UNC column and placed into the TSIS_CAL_ERR column. This provides a better representation of the uncertainty of TSIS-SIM, in TSIS_UNC, as it represents only the observed on-orbit performance. This change does not affect TAV V01, or STICR.

Date Issued
  • 2021-01-28
Academic Affiliation
Last Modified
  • 2021-03-05
  • STICRV01
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Date Available
  • 2021-01-20
Peer Reviewed