SOME PECULIARITIES OF MASS, VELOCITY AND RADIANT DISTRIBUTIONS OF SPORADIC METEOROIDS

The dependence of the s value on the elongation of the meteor radiant from the Earth's apex and on the inclination of meteorid orbit to the ecliptic plane have been found from data obtained by radar, TV and pho tographic observations. All the observational methods give the minimum value of s in the apex and the maximum in the elongation range from 9 0-degrees to 150-degrees. The s value has a minimum within the inclina tion band 50-degrees-70-degrees and a maxima for the orbits near the e cliptic plane (s = 2.6-2.8 for i < 15-degrees and s = 4.5-5.6 for i > 170-degrees). Sporadic meteor radiant distributions have a symmetry re lative to the plane passing through the Earth's apex, ecliptic pole an d antapex. It has also been shown that we can expect the symmetry of t he one-year-averaged sporadic meteor radiant distributions relative to the ecliptic plane. The meteoroid velocity distributions depend on th e elongation angle of a radiant from the Earth's apex only.