Data from the Total Solar Irradiance (TSI) Calibration Transfer Experiment (TCTE) have been released to the public. The current version is 2. TCTE is managed by the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado, Boulder. The Principal Investigator for TCTE is Dr. Greg Kopp.
TCTE was launched on Nov. 13, 2013 aboard the Air Force’s STPSat-3 spacecraft. It includes a Total Irradiance Monitor (TIM) instrument, similar to the one flown on the SOlar Radiation and Climate Experiment (SORCE) mission. TIM was designed and built for measuring TSI and monitoring changes in incident sunlight to the Earth's atmosphere, using an ambient temperature active cavity radiometer to a designed absolute accuracy of 350 parts per million, and a precision and long-term relative accuracy of 10 ppm per year.
There are two TCTE data collections available: daily and 6-hourly averaged total solar irradiances covering the full wavelength spectrum. The data are normalized to one astronomical unit (1 AU). Also included in the data set are irradiances normalized to time-varying earth distance from the sun, which are useful for climate modeling applications.
The figure below shows the most recent TCTE TSI data, through June 19, 2015 (the date of publication of this announcement):
For more information about the TCTE mission and accessing the data, please see the
GES DISC Solar Irradiance page at http://disc.sci.gsfc.nasa.gov/solar_irradiance
TCTE homepage at http://lasp.colorado.edu/home/tcte/
Questions or comments? Email the NASA GES DISC Help Desk: firstname.lastname@example.org