Some aspects of interstellar dust particle capture in the Solar System

Details Some aspects of interstellar dust particle capture in the Solar System Some aspects of interstellar dust particle capture in the Solar System

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..641k&link_type=abstract

In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed

Physics

Interstellar Cosmic Dust, Electromagnetic Radiation

Scientific paper

A possible capture of interstellar dust particles in the Solar System is a complex function of dust properties (size, shape, chemical composition, porosity) and forces acting on the particles. Dynamics of dust grains is affected by gravity of the Sun, electromagnetic radiation force, and, also Lorentz force has to be considered for submicron-sized charged particles. Physical consequences of the capture are in permanent removal of certain amount of matter from the continuous interstellar dust stream. Lot of the particles vanish (sublimate or hit the Sun). Particles of spherical shape cannot survive in the Solar System - they always vanish due to their close interactions with the Sun, as simulations using Poynting-Robertson effect show. However, numerical calculations have shown that nonspherical particles can be captured in the Solar System for much larger values of impact parameters than it is for spherical particles. As a consequence, nonspherical particles exhibit more than 60-times larger perihelion distances above the Sun's surface than it would correspond to spherical particles (effective radii 0.1 to 2.0 microns). Thus, nonspherical particles can be captured and move in areas where sublimation is not important and the particles can survive in the Solar System for a long time.

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