Two bright spots on Saturn's globe as observed by Voyager 2

Two bright spots shown by Voyager 2 images on Saturn's north temperate belt are discussed in terms of a simple photometric model in which the brightness differences are caused by obscuring matter above the main cloud layer. In the ultraviolet light, in which scattering by small particles is very effective, the spots are invisible. In the violet light they seem to be holes in the dark matter and therefore the brighter layer below it becomes visible. Also they could be rises in the bright matter. In the green light the spots are more complicated since this wavelength interval contains very strong emission spectra lines of ammonia.