Authors: Martin Snow, William McClintock, Gary Rottman, Tom Woods
Affiliation: LASP, University of Colorado
The SOLar-STellar Irradiance Comparison Experiment (SOLSTICE) on SORCE has
been making daily spectral observations of the Sun from 115-300 nm. Careful
preflight calibration and in-flight degradation monitoring with stellar irradiances
produces absolute irradiance at the 5% level and relative measurements at the
1% level. The ratio of solar to stellar irradiance is an absolute measurement
of solar variability that is independent of instrumental degradation. This ratio
can be re-measured in future epochs to create an irradiance record spanning
centuries.
The wavelength range of SOLSTICE includes the important chromospheric Magnesium
II h & k lines as well as Lyman alpha. The SORCE observations extend the
observational database of solar variability started by the UARS SOLSTICE, and
we will present recent results.