In-Flight Performance of the Virgo Solar Irradiance Instruments on SOHO
Dewitte, Steven; Chevalier, André; Fröhlich, Claus; Jiménez, Antonio; Wehrli, Christoph; Finsterle, Wolfgang; Roth, Hansjörg; Crommelynck, Dominique A.; Fichot, Alain; Anklin, Martin
Switzerland, Belgium, Spain
Abstract
The in-flight performance of the total and spectral irradiance instruments within VIRGO (Variability of solar IRradiance and Gravity Oscillations) on the ESA/NASA Mission SOHO (SOlar and Heliospheric Observatory) is in most aspects better than expected. The behaviour during the first year of operation of the two types of radiometers and the sunphotometers together with a description of their data evaluation procedures is presented.