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Laboratory for Atmospheric and Space Physics

TSI Data File Summary

The SORCE Total Irradiance Monitor (TIM) measures the total solar irradiance (TSI), the spatially and spectrally integrated absolute intensity of solar radiation, at the top of the Earth’s atmosphere. The SORCE TSI data are produced both as daily and 6-hourly mean irradiances reported at a solar distance of 1 astronomical unit (AU) and zero relative line-of-sight velocity with respect to the Sun, as well as at the Earth’s center. Each TSI product contains science results for the entire SORCE mission (beginning February 25, 2003) and is updated daily to include new measurements.

Learn more about SORCE TSI data products.

SORCE Instrument TIM
Temporal Cadence Daily and 6-Hourly
Detector Active Cavity Radiometer (ambient temperature)
Accuracy 350 ppm (1 σ)
Long-Term Repeatability 10 ppm per year (1 σ)
Data Level 3


TIM TSI Data Product Release Notes