The orbital evolution of model meteoroids ejected from the comet Encke
has been investigated. Tile particles abandon the mother body with ve
locities 20 and 40 ms(-1) at its perihelion within the interval of the
past 10,000 years. Their 10,000 years old osculating orbits were nume
rically integrated forward, using a dynamical model of the solar syste
m consisting of all planets. Forces from solar electromagnetic and cor
puscular radiation effecting the particles are considered, too. Orbita
l dispersions of the model meteoroids are presented. The importance of
nongravitational forces for a long-term orbital evolution of meteoroi
d streams is shown.