TSI Data File Summary
The TSIS 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 TSIS 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 TSIS mission (beginning January 11, 2018) and is updated daily to include new measurements.
Learn more about TSIS TSI data products.
| TSIS Instrument | TIM |
| Temporal Cadence | Daily and 6-Hourly |
| Detector | Active Cavity Radiometer (ambient temperature) |
| Accuracy | Time-dependent; see data products |
| Long-Term Repeatability | 10 ppm per year (1 σ) |
| Data Level | 3 |