LARGE-BODY METEOROIDS IN THE LEONID STREAM

There are presently no direct observational constraints upon the size of the largest meteoroids within the Leonid stream. An upper lower bou nd may, however, be placed through secondary observations relating to the occurrence of electrophonic sounds during the 1833 Leonid storm. B y considering the ablation and very low frequency radio wave emission conditions necessary to produce electrophonic sounds, a preatmospheric lower bound of 1.24 +/- 0.1 m is placed upon the diameter of the larg est meteoroids within the Leonid stream. The presence of meter-sized m eteoroids within the Leonid stream indicates that mechanisms beyond th at of surface ice sublimation are active in adding meteoroids to comet ary streams.