CAOSP abstracts, Volume: 27, No.: 2, year: 1997

Abstract: Diurnal variation of meteor head echoes around the vernal and autumnal equinox obtained from 1609 head echoes reduced from the original film records of the Springhill Meteor Observatory high-power radar is analysed and discussed. Occurence rate of head echoes in the sporadic periods is clearly dependent on the apex motion by a factor of 5:1 during the vernal equinox days and 2.5:1 during the autumnal equinox days. However, the level of the head echo occurence in autumn is twice as high as in spring days. The radial velocity distribution of head echoes implies two distinct velocity groups centred at 15 km/s and 35 km/s, more pronounced in the spring sample. Possible geometrical influences on the occurence of head echoes are discussed.

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