Comment on the paper 'On the influx of small comets into the earth's upper atmosphere. II - Interpretation'

Details Comment on the paper 'On the influx of small comets into the earth's upper atmosphere. II - Interpretation' Comment on the paper 'On the influx of small comets into the earth's upper atmosphere. II - Interpretation'

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..701f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, July 1986, p. 701; Authors' Reply, p. 703, 704.

Other

7

Atmospheric Entry, Comets, Earth Atmosphere, Upper Atmosphere, Cometary Atmospheres, Ice, Interplanetary Dust, Thickness

Scientific paper

Frank et al. (1986) argue that, on the basis of dayglow observations, about 20 small comets of mass roughly 100,000 g hit the earth each minute. The proposed comets appear to require dust mantles; for otherwise they would evaporate quickly and contribute to the solar wind. Such an enrichment is not observed. An order-of-magnitude argument based on comet sizes, densities, and meteoritic dust influx is used here to show that the dust mantles can have a maximum thickness of about 200 microns. A reasonable estimate gives a thickness of about 0.2 micron. The mantles are thus too thin to suppress evaporation.

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