Документ взят из кэша поисковой машины. Адрес оригинального документа : http://star.arm.ac.uk/~ambn/367m.abs Дата изменения: Tue Dec 18 14:33:05 2001 Дата индексирования: Mon Oct 1 20:33:35 2012 Кодировка: Поисковые слова: aurora

On 2001 November 18th UT, the Earth will have close encounters with trails
of meteoroids and dust generated over the past few centuries by Comet
55P/Tempel-Tuttle. It has previously been shown that these trail encounters
will produce spectacular meteor displays, observers at east Asian longitudes
and in North America having the chance to see this year's Leonid activity
peaks in a moonless sky. Work by Lyytinen et al. has discussed the relevance
of dispersive radiative effects in trail aging. In this article, we find
that combining our existing ZHR model with an empirical aging parameter still
leads to expected rates of several thousand from the east Asian trail
encounters. We also consider what may be learned from high-resolution
observations of radiants during such outbursts, of particular interest in
2001 because of meteor activity expected simultaneously from more than one
trail. The Leonid radiant structure is shown to contain radiants from each
dust trail separated by several arc minutes, and moreover each dust trail
radiant contains its own internal structure which relates to the Comet's
activity during the perihelion passage when the trail was generated.