Meteoroid streams and meteor showers IPWilliamsa

aAstronomy Unit, Queen Mary and Westfield College, Mile End Rd, London El 4NS, UK

The generally accepted evolution of meteoroids following ejection from a comet is first spreading about the orbit due to the cumulative effects of a slightly different orbital period, second a spread in the orbital parameters due to gravitational perturbations, third a decrease in size due to collisions and sputtering, all in due course leading to a loss of identity as a meteor stream and thus becoming part of the general sporadic background. Finally Poynting-Robertson drag causes reduction in both semi-major axis and eccentricity producing particles of the interplanetary dust complex. The aim of this presentation is to review the stages involved in this evolution.

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