Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.325..457m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 325, Issue 2, pp. 457-462.
Astronomy and Astrophysics
Astronomy
16
Celestial Mechanics, Comets: Individual: 55P/Tempel-Tuttle, Meteors, Meteoroids
Scientific paper
Most astronomers expected a significant meteor shower associated with the Leonid meteoroid stream to appear in 1998 and 1999. An enhanced shower was widely observed in both years, and details can be found in many published articles. In 1998, one remarkable feature was the appearance of a strong component, rich in bright meteors, which appeared about 16h before the expected maximum of the main shower, but another observed feature was an abnormal peak in the ionosphere characteristic value fbEs which was detected about 18h after the main shower. A very high value of fbEs persisted for over an hour. The likely explanation is that the ionosphere was bombarded by an additional swarm of meteoroids, much smaller than those that produce a visible trail or an ionization trail that can be picked up by radio detectors. The different dynamical behaviours between small and large meteoroids are investigated and, in consequence, an explanation for the observed phenomena is offered and 1933 is suggested as being the likely ejection time.
He Youwen
Ma Yuehua
Williams Iwan P.
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