Meteor radar rates and the solar cycle

Details Meteor radar rates and the solar cycle Meteor radar rates and the solar cycle

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.259...99l&link_type=abstract

Nature, vol. 259, Jan. 15, 1976, p. 99-101. Research supported by the Statens Naturvetenskapliga Forskningsrad; Knut och Alice W

Computer Science

11

Meteoroid Showers, Radar Echoes, Solar Activity Effects, Solar Cycles, Atmospheric Density, Radar Measurement, Secular Variations, Solar X-Rays

Scientific paper

Observations are reported which indicate a long-term variation in meteor echo count rate accompanied by constancy of the height of first appearance of meteors from a given shower and variation in the average endpoint height. Data from the years 1953 to 1972 on the mean nocturnal hourly rate of meteor radar echoes of all durations are presented, and the variation of meteor radar rates with position in the solar cycle is analyzed. The phase of the radar rate curve is shown to suggest that peak meteor rates are observed one to two years before a minimum in solar activity. It is proposed that this phenomenon can be explained by a solar-controlled variation of the atmospheric density gradient at the meteor ablation level, probably caused by a variation in the solar X-ray flux. The heating mechanism required to produce such a solar-cycle effect in the atmospheric density gradient is considered.

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