The possible mechanism of helium isotopes separation in the solar atmosphere due to plasma effects have been proposed by G.E. Kocharov (1977), I. Ibragimov and G. Kocharov (1977). The cycle of papers: G. Kocharov and L. Kocharov (1978); L. Kocharov (1979 a,b,c,d, 1980); G. Kocharov, L. Kocharov and Yu. Charikov (1980) is devoted to the development of the theory and to the search of concrete model of corresponding physical processes in the solar plasma. Here we consider briefly the modern state of this problem.