Active Cavity Radiometer Irradiance Monitor II

Project Description
The second Active Cavity Radiometer Irradiance Monitor (ACRIM)
satellite solar monitoring experiment (ACRIM II) has been
providing total solar irradiance observations since its launch
as part of the Upper Atmospheric Research Satellite (UARS) in
late 1991. The UARS is a three-axis stabilized, Earth-oriented
spacecraft with an orbit at inclination of 57 degrees and
altitude 585 km. The UARS orbit provides about 60 minutes of
sunlight in each orbit of which about 35 minutes are available
for solar viewing. During this period the Solar/Stellar Pointing
Platform points the instrument to the center of the Sun.

For more information link to:
http://www.ngdc.noaa.gov/stp/SOLAR/IRRADIANCE/uars.html