Physics
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sosyr..36..440b&link_type=abstract
Solar System Research, v. 36, Issue 5, p. 440-445 (2002).
Physics
Scientific paper
Contour visual observations of the Leonid meteor shower were made on December 18, 1999 by the method in which different groups of observers counted meteors in zenith, near the horizon, and observed through binoculars to study the luminosity function and the space density of the swarm. The luminosity function was obtained in the range of magnitudes from -8m to +9m. Over a wide range of magnitudes, the luminosity function is found to be nonlinear and is adequately approximated with a second-order curve. The logarithm of the meteor space density Φ(m) reaches saturation at about 10m, indicating that particles that give rise to meteors fainter than 10m are absent in the swarm. The meteor stream reached its activity peak at a solar longitude of 235°, 287 (2h05m UT). The peak visual zenithal hourly rate was about 7000 per one observer over an averaging interval of 1 min. The swarm space density increased by a factor of 6 within 0.5 hours and exceeded 600 particles per 109 km3 for meteors brighter than +4m. In the peak night, the luminosity-function exponent demonstrates no regular trend and reflects the intercepting of certain swarm clouds by the Earth.
Babina Yu. V.
Karkach D. V.
Kichizhieva M. V.
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