Variations in the Influx of Small Meteoroids

A morphological comparison between radar meteor survey data obtained at Ottawa (Millman and McIntosh, 1964) from 1958 to 1962 and that obtained from Christchurch (Ellyett and Keay, 1963) in 1960-61, confirms that the Daytime Arietid, Delta Aquarid meteor shower association is the most prominent feature of the annual activity. The data from Canada and New Zealand are easily reconciled as far as this activity is concerned and also for the weaker Eta Aquarid shower which, having a radiant at zero declination, is equally prominent in both sets of data. Furthermore, the data from both hemispheres is consistent with a forty per cent increase in overall activity during the second half of the year.