In this paper we discuss a hypothesis proposed by Anatoly N. Nevzorov that considerable amount of water in cold clouds can exist in a specific phase state with the refractive index ≈1.8 and density higher than 2 g/cm3 (so called A-water). One of the arguments mentioned in favor of this hypothesis is that the glory phenomenon can be better explained by existence of A-water. In our paper we consider this argument in detail studying the phase functions of A-water clouds for different distributions of droplet size.
clouds, A-water, glory, rainbow, halo, phase function, polarization