Some peculiarities of mass, velocity and radiant distributions of sporadic meteoroids

Abstract

The dependence of the s value on the elongation of the meteor radiant from the Earth's apex and on the inclination of meteoroid orbit to the ecliptic plane have been found from data obtained by radar, TV and photographic observations. All the observational methods give the minimum value of s in the apex and the maximum in the elongation range from 90° to 150°. The s value has a minimum within the inclination band 50°–70° and a maxima for the orbits near the ecliptic plane (s = 2.6–2.8 for i < 15° and s = 4.5–5.6for i > 170°). Sporadic meteor radiant distributions have a symmetry relative to the plane passing through the Earth's apex, ecliptic pole and antapex. It has also been shown that we can expect the symmetry of the one-year-averaged sporadic meteor radiant distributions relative to the ecliptic plane. The meteoroid velocity distributions depend on the elongation angle of a radiant from the Earth's apex only.