Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jimo...28..195a&link_type=abstract
WGN, Journal of the International Meteor Organization, vol. 28, no. 6, p. 195-208
Physics
14
Scientific paper
A set of 614.22h observing hours covering the activity of the Leonid meteor shower as logged by 230 observers was used to determine the population index and activity profiles of the 2000 Leonids. Three clear maxima in terms of Zenithal Hourly Rates (ZHR) are found. The first peak at lambda=235+-0.01 (November 17, 8h07m UT) falls about 15 minutes after the predicted passage time of the dust trail of Comet 55P/Tempel-Tuttle. The activity level was ZHR=130+-20. The second maximum is broad and is best described by a 1-hour plateau of activity with a maximum possibly centered at lambda=236.09+-0.01 (November 18, 3h24m UT) with ZHR=290+-20. This enhancement covers the predicted time of the dust trail of the 1733 perihelion passage of the Comet. The third maximum is found near lambda=236.25+-0.01 (November 18, 7h12m UT) with ZHR=480+-20 accurring about 40 minutes before the predicted 1866 dust trail passage. The population index r, however, reaches a maximum value of 2.2 at exactly the predicted time - 40 minutes after the ZHR maximum. The r-value was almost constant for four hours between 3h and 7h UT on November 18.
Arlt Rainer
Gyssens Marc
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