Assessment of Degradation of VIRGO Radiometers Onboard SOHO Anklin, M. ; Fröhlich, C. ; Finsterle, W. ; Wehrli, C. ; Crommelynck, D. A. Abstract Publication: Correlated Phenomena at the Sun, in the Heliosphere and in Geospace Pub Date: December 1997 Bibcode: 1997ESASP.415..459A