Daily Total Solar Irradiance
Total solar irradiance describes the radiant energy emitted by the sun over all wavelengths that falls each second on 1 square meter outside the earth's atmosphere--a quantity proportional to the "solar constant" observed earlier in this century. It measures the solar energy flux in Watts/square meter. The data contains six sets of satellite observations: values from NIMBUS-7, from the Solar Maximum Mission (SMM) spacecraft, from the Earth Radiation Budget Satellite (ERBS), from the NOAA-9 and 10 platforms, and from the Upper Atmospheric Research Satellite (UARS). Measurements span the periods:
NIMBUS-7 16 Nov 78-13 Dec 93; SMM 16 Feb 80-01 Jun 89; ERBS 25 Oct 84-21 Dec 94; NOAA-9 23 Jan 85-20 Dec 89; NOAA-10 22 Oct 86-01 Apr 87; UARS 5 Oct 91-30 Sep 94.
To get to our FTP archive of solar irradiance data, click here. For more information on the various satellies, click on the appropriate hypertext link: