Romoli, M.; Frazin, R. A.; Kohl, J. L.; Gardner, L. D.; Cranmer, S. R.; Reardon, K.; Fineschi, S.

The Radiometric Calibration of SOHO (ESA SR-002). Edited by A. Pauluhn, M.C.E. Huber and R. von Steiger, p.181, 2002

Abstract

The UVCS White Light Channel (WLC) is designed to measure the linearly polarized radiance (pB) of the corona, in the wavelength band from 450 nm to 600 nm, in order to derive one of the fundamental parameters of the solar corona: the electron density. This paper gives a thorough description of the in-flight radiometric calibration of the WLC, which uses the star ? Leo and the planet Jupiter as transfer standards and is based on calibrations of ground-based instruments. The method for computing the polarized radiance from the measurements is also described, together with the stray light and polarization characterizations obtained from dedicated, in-flight measurements.