  We numerically investigate the migration of dust particles with initial
orbits close to those of the numbered asteroids. The fraction of silicate
particles that collided with the Earth during their lifetimes varied from 0.2%
for 40 micron particles to 0.008% for 1 micron particles. Almost all particles
with diameter d>4 microns collided with the Sun. The peaks in the migrating
asteroidal dust particles' semi-major axis distribution at the n/(n+1)
resonances with Earth and Venus and the gaps associated with the 1:1 resonances
with these planets are more pronounced for larger particles.

Astrophysics