The mass distribution of comets and meteoroid streams and the shower/sporadic ratio in the incident visual meteoroid flux

Details The mass distribution of comets and meteoroid streams and the shower/sporadic ratio in the incident visual meteoroid flux The mass distribution of comets and meteoroid streams and the shower/sporadic ratio in the incident visual meteoroid flux

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..198h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 15, 1990, p. 198-203.

Astronomy and Astrophysics

Astronomy

13

Comets, Mass Distribution, Meteoroid Showers, Zodiacal Dust, Earth Orbits, Solar System, Space Observations (From Earth)

Scientific paper

The large dust particles that comets emit as they decay produce meteoroid streams. If the earth passes close to the center of a meteoroid stream, a shower of meteors is produced in the atmosphere, and the intensity of this shower can be quantified by the maximum zenithal hour rate (ZHR) of the meteors that are observed. If, as seems reasonable, the dust/snow mass ratio and the mass distribution of the dust particles are similar in all comets, then comets and meteoroid streams are expected to have similar mass distribution indices. This expectation has been confirmed for the more massive comets and streams by comparing the distribution of shower ZHRs with the distribution of cometary masses. The latter distribution is also used to predict the expected numbers of minor meteor showers, with low ZHRs, that are present in what was previously referred to as the sporadic background. It is concluded that, on a typical 'non-shower' night, (20 + or - 3) percent of the observed visual meteors belong to minor showers, and the remaining percentage are truly sporadic.

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