New stratospheric UV/visible radiance measurements

Abstract. A stratospheric balloon was launched on 12 October 1986 from the "CNES" base at Aire sur l'Adour (France) to record twilight radiance in the stratosphere. The near-UV and visible radiances were continuously monitored by a photometer during sunrise. Some observations are presented for different viewing azimuthal planes and viewing elevation angles. They show the influence of aerosols layers and clouds which can be also seen on related photographs. The results as a whole may be used for testing some radiative models, especially for twilight conditions.