INTERPLANETARY DUST PARTICLES AND SOLAR ELECTROMAGNETIC-RADIATION

The action of the solar electromagnetic radiation on the motion of int erplanetary dust particle of the plane mirror form is investigated. It is shown that for rapidly rotating plane mirror the speed of inspiral ling toward the Sun is about a factor of 4 lower than that for spheric al mirror of the same cross-sectional area. In principle, it is also p ossible that the plane mirror can be expelled from the inner part of t he Solar System. Presented derivation is a little more general - it is considered that some parts of the incident radiation can be also abso rbed or transmitted, not only reflected. Obtained results show that th e Poynting-Robertson effect is strongly model-dependent. It is suggest ed that for rear irregular porous particles the speed of inspiralling toward the Sun can be smaller than that for perfectly absorbing sphere . Orbital plane can change in time.