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ESABASE/SUNLIGHT is a software tool to calculate illumination, effective illumination, exposure time, incident electromagnetic power, absorbed electromagnetic energy for spacecraft surfaces during planet orbiting missions considering sun and planet irradiation, effects of eclipse and self-shading, multireflections, transmission, pointing and (variable) geometry. Calculation applies a fast Monte Carlo raytracing algorithm and is based on wavelength dependent spectra and material properties. ESABASE/SUNLIGHT is fully integrated in the CAE-frame ESABASE which offers a powerful geometry specification language, orbit generator, pointing facility and advanced libraries as well as gateway, pre-, postprocessing and display tools with the benefits of standardisation and exchange to other analysis tools.

The ESARAD radiative analysis program has been in use in the European thermal analysis community for approximately two years. The first part of this paper presents an assessment of ESARAD from a user's viewpoint. The second part presents work related to ESARAD performed in the Thermal Control and Life Support Division of ESTEC. In particular, work relating to two topics is presented: 1) ESARAD programming - a set of add-on software routines developed to complement ESARAD's basic capabilities is presented. 2) ESARAD applications - two thermal analysis problems from the ENVISAT - 1 and XMM spacecraft are presented. The last part of the paper is a brief description of the status of accuracy control in ESARAD.