The flux of meteorites on the earth's surface

Details The flux of meteorites on the earth's surface The flux of meteorites on the earth's surface

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989metic..24..173h&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 24, Sept. 1989, p. 173-178.

Physics

49

Earth Surface, Flux Quantization, Meteorites, Data Bases, Fireballs, Mass Distribution, Photographic Recording, Size Distribution

Scientific paper

Values for the number and size distributions of meteorites landing on earth are derived from a study of photographic observations of bright fireballs with the Canadian camera network. The observations cover 11 years from 1974 to 1985. This analysis is an extension of a previous study and represents a 30 percent increase in the data base. The cumulative plot of numbers vs estimated mass of the largest fragment for each event shows a change in slope near 0.6 kg, due to deficiency of small meteorites surviving from the group of slow fireballs. The change can be explained by a mass dependence of the fraction of the incoming object that survives as the largest fragment. For larger falls, the main mass appears to represent a decreasing fraction of the total mass of the surviving meteorites; estimates of these effects are used to derive the final distribution of both main masses and total masses of meteoritic events. For total masses greater than 1 kg, the population index is 1.82, close to previous estimates. About nine events per year drop at least 1 kg of meteorites in an area of a million square km, and the same area receives an annual influx of 54 kg from meteorite events with total masses between 0.01 and 100 kg.

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