WHAT CAN METEOROID STREAMS TELL US ABOUT THE EJECTION VELOCITIES OF DUST FROM COMETS

The parent bodies of a number of major meteoroid streams are not in do ubt and the orbits of these parents are also well determined. For thes e major streams individual orbits for a significant number of member m eteoroids have also been determined. There is a significant spread in the determined values of the semi-major axis of individual meteoroids in a particular stream and this paper assumes that this spread is caus ed primarily by a variation in the ejection process and draws conclusi ons regarding the value of the ejection velocities from this.