TIM Status and Contributions to the Total Solar Irradiance Record

Greg Kopp [greg.kopp@lasp.colorado.edu], LASP, University of Colorado, Boulder

The Total Irradiance Monitor (TIM) continues to perform excellently, producing daily total solar irradiance (TSI) measurements. The instrument shows very little optical degradation from solar exposure, and the electronics show no signs of change since launch. Results from 1 March 2003 to the present are released regularly with continual refinements to the automated data production.
The most significant results from the TIM to date include:

  1. The measured TSI from the TIM is about 1361 W/m^2, or 4-5 W/m^2 lower than that measured by other current TSI instruments. This may affect Earth energy balance models.
  2. The TIM detected the first solar flare measured in TSI, giving an integrated flare energy of roughly 5e32 ergs from the 28 October 2003 X17 flare. This is the first direct measurement of the total energy in a flare.
  3. The TIM has demonstrated efficiency degradation levels of ~50 ppm/yr with corrections known to better than 10 ppm/yr. This level of long-term stability may eventually facilitate the direct measurement of a secular change in TSI.