Radio Echo Observation of the Major Night-Time Meteor Streams

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Abstract
This paper describes radio echo observations of the major night-time streams for the period 1946–1951. Radiant positions and velocities have been measured for the Perseids, Geminids and Quadrantids, and orbits have been computed for each stream. The characteristics of these streams are discussed, and evidence is presented for the existence of a core of larger meteors in the region of maximum density in the streams. A progressive movement of the radiant point has been detected for the Perseid and Geminid showers, which is in agreement with previous observations. The velocity distributions indicate that there may be a spread in heliocentric velocity within the streams of the order of 1–2 km/s. Radiant positions and hourly rates are also given for the Orionids, δ Aquarids, Lyrids and the night-time Taurids and Arietids.

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