Bulletin 15 of the International Leonid Watch: First Global Analysis of the 1999 Leonid Storm

Details Bulletin 15 of the International Leonid Watch: First Global Analysis of the 1999 Leonid Storm Bulletin 15 of the International Leonid Watch: First Global Analysis of the 1999 Leonid Storm

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jimo...27..286a&link_type=abstract

WGN, Journal of the International Meteor Organization, vol. 27, no. 6, p. 286-295

Computer Science

38

Scientific paper

An overall activity profile of the 1999 Leonid meteor shower is presented based on the observations of 434 observers who reported 277172 Leonids in 10806 observing periods. A storm of Leonid activity was observed from western Asian, European, and African locations at a solar longitude of lambda=235.285+-0.001, corresponding to November 18, 1999, 2h02m+-2m UT with a peak equivalent ZHR of 3700+-100 based on 2.8-minute intervals. Solar longitudes refer to equinox J2000.0. The flux density of particles causing meteors brighter than magnitude +6.5 is 1.4+-0.3 particles per square kilometer and per hour. This corresponds to a number density of 5400+-1200 particles per 10^9 cubic kilometer. Additional maxima were found in the ZHR peak profile; one of them at lambda=235.272 or 1h43m UT can be associated with the cometary ejecta from the 1932 perihelion passage. The time of this peak as well as the main peak, which is caused by particles from the 1899 passage, are reproduced by particle simulations. A clear second activity outburst occurred at lambda=235.87+-0.04 (November 18, 1999, 16h+-1h UT) with a maximum ZHR of 180+-20. The Leonid storm component is found to exhibit an unusual magnitude distribution with a lack of both very bright and very faint meteors.

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