GRAVITATION EFFECT ON A FLUX OF SPORADIC MICROMETEOROIDS IN THE VICINITY OF NEAR-EARTH ORBITS

摘要

The new approach to gravitation effect determination inrncalculating the flux of sporadic micrometeoroids in thernnear-Earth space is proposed. The technique is based onrnintegrating the equations of motion of sporadicrnmicrometeoroids with allowance for bending theirrntrajectories when particles approach the Earth. Therntechnique and results of calculation of the gravitationalrnfocusing factor k_g for various conditions are presented.rnThe feature of the proposed technique for calculatingrncoefficient k_g consists in the fact that this coefficientrndoes not explicitly depend on the values of particles’rnvelocity at the last point. The results of investigation ofrncoefficient k_g have shown that for the given initialrnvelocity of micrometeoroids the values of thisrncoefficient depend on deflection of its trajectories fromrnthe direction to the Earth center. It is shown that forrnlow-altitude orbits the flux density growth can reach 60rn%. The distribution of probabilities of various directionsrnof particles flying to spacecraft structural elements isrnfound to be non-uniform.