Double and multistation data on meteors from photographic and television records are used. to derive relatlve and absolute numbers of sporadic meteoroids coming to the Earth s vlnicity and their mass accession. Seven different meteoroid populations are dealt with separately inside a mass interval of 2 x 10^ g to 2 x 10^-5 g and their cumulative numbers with decreasing mass determined. This paper is an abstract of more extensive paper, which will be published in Bull. Astron. Inst. Czechosl. In 1988.
The exact solution of the single-body motion and ablation of a meteoroid in the atmosphere is applied to one of the most precise double-station records of a fireball photographed from Dushanbe Oct 30, 1962. The entire trajectory of 5.2 seconds duration from 77 km to 36 km of height with 268 time marks corresponds to a single value of the ablation coefficient.