Other
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....10618j&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #10618
Other
Scientific paper
An airborne and ground-based observing campaign was organized to cover the 2002 Leonid meteor storms. Two dust trails of comet 55P/Tempel-Tuttle were directed in Earth's path by planetary perturbations, dating from ejection in 1766 (~ 04:00 UT, Nov. 19) and 1866 (~ 10:30 UT, Nov. 19). Models of comet dust formation and evolution predicted a range of relative peak strength and stream cross section. The airborne effort was deployed from Spain. Enroute to Nebraska, both storm peaks were observed under excellent observing conditions. European observers saw the first storm peak at 04:06 UT (ZHR ~ 2,300/hr), while observers in the America's witnessed a storm peaking at 10:47 UT (ZHR ~ 2,600/hr). Both peaks were narrow, with a full-width-at-half-maximum of only 0.52 and 0.50 hours, respectively, in good agreement with only one of the models, which does not include broadening over time by radiation pressure or perturbations on dynamically different orbits. The strong showing of the 1767-dust trail relative to that of 1866 illustrates again that the trail positions are slightly further inward to the sun than calculated in earlier models. High rates persisted between the two storm peaks, which is probably a manifestation of the Leonid Filament, peaking before 03 UT. The Fillament is thought to be due to perturbations of orbital period over more revolutions. The high abundance of faint meteors in both peaks is a puzzle. Although the smaller grains are supposed to have the higher surface-to-mass ratio and therefore the stronger push from water drag during ejection and solar radiation pressure while in orbit, last year's Leonid storms did not show that effect. Predictions for future meteor outbursts of other streams in the next fifty years will be discussed, which can help increase our understanding of the dynamical evolution of comet dust in the solar system.
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