Search for meter-sized bodies in meteoroid streams

We present the results of a ground-based observational effort to detect large meter-sized meteoroids in known meteoroid streams, while they are still moving in space a few hours to days in advance of their approach to Earth. Although no stream objects have been detected in any of the targeted streams, our observations are sufficient to place meaningful constraints to the population of objects in this poorly explored size regime. In particular, for at least two streams (Geminids and Taurids) we give evidence that the lack of objects is limited to the meter to decameter size range, while significant populations exist for both smaller and larger sizes. This information, when combined with other properties of the streams, is useful to better clarify the possible physical mechanisms that may be involved in the formation of at least some streams of possible asteroidal origin.