Interplanetary dust particles and solar radiation

Physics

Scientific paper

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Corpuscular Radiation, Electromagnetic Radiation, Interplanetary Dust, Motion Aftereffects, Orbits, Particle Motion, Solar Wind, Approximation, Equations Of Motion, Mass, Sun, Velocity

Scientific paper

The problem of the action of the solar radiation on the motion of interplanetary dust particle is discussed. Differences between the action of electromagnetic solar radiation and that of the solar wind are explained not only from the point of view of the physical nature of these phenomena but also from the point of view of dust particle's orbital evolution. As for the electromagnetic solar radiation, general equation of motion for the particle is written and the most important consequences are: (1) the process of inspiralling toward the Sun is not the only possible motion -- even spiralling from the Sun is also possible, and, (2) the orbital plane of the particle (its inclination) may change in time. As for the solar wind, the effect corresponding to the fact that solar wind particles spread out from the Sun in nonradial direction causes that the process of inspiralling toward the Sun is in more than 50% less effective than for radial spread out; in the region of the asteroid belt (long period orbits) the process of inspiralling is changed into offspiralling. Also shift in the perihelion of dust particle's orbit exists.

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