Video and radar observations of the 2000 Leonids: evidence for a strong flux peak associated with 1932 ejecta?

Details Video and radar observations of the 2000 Leonids: evidence for a strong flux peak associated with 1932 ejecta? Video and radar observations of the 2000 Leonids: evidence for a strong flux peak associated with 1932 ejecta?

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.335..473b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 335, Issue 2, pp. 473-479.

Astronomy and Astrophysics

Astronomy

6

Techniques: Radar Astronomy, Meteors, Meteoroids

Scientific paper

Video and radar observations of the 2000 Leonid shower are presented. We find strong evidence that the first peak in the shower on 2000 November 17 near 8 UT resulting from 1932 ejecta is much stronger than previously recognized and larger than the broader peak on November 18 resulting from 1866 and 1733 ejecta. In particular, we find a TV-radar average peak flux value on November 17 at solar longitude 235°.29 +/- 0°.02 near 0.15 +/- 0.02 meteoroid km-2 h-1(Mv > +6.5), which corresponds to a zenithal hourly rate (ZHR) ~900 assuming a mass index of 1.7. Similarly, we find the second peak on November 18 to be located at 236°.26 +/- 0°.02 with a maximum flux value of 0.11 +/- 0.02 meteoroid km-2 h-1 corresponding to a ZHR of 600. Evidence for this narrower and stronger early peak on November 17 is present in several other observations by radar/radio, although only for data smoothed over 15-min intervals or less. The implications of this higher early peak for the 2000 Leonids associated with 1932 ejecta for predictions and visual observations of the shower in 2002 are briefly discussed.

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