Bulletin 20 of the International Leonid Watch: Global analysis of the 2004 Leonids

Details Bulletin 20 of the International Leonid Watch: Global analysis of the 2004 Leonids Bulletin 20 of the International Leonid Watch: Global analysis of the 2004 Leonids

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jimo...32..155a&link_type=abstract

WGN, Journal of the International Meteor Organization, vol. 32, no. 6, p. 155-158

Physics

1

Scientific paper

An analysis of visual observations of the 2004 Leonid meteor shower is presented. The shower was weakly active, and a total of 1650 Leonids were recorded during an observing time of 262.17h. A background activity ZHRs of 20-30 with a maximum of ZHR = 30+-3 is found for the period between 235.5 and 238.0 deg solar longitude (2004 Nov 17, 14h - Nov 20, 02h UT). Two times of enhanced rates appear to be significant. The first reaches a ZHR of 37+-4 at solar longitude 235.8+-0.1 deg (Nov 17, 21 h UT). The second peak has a ZHR of 26+-3 at solar longitude 237.95+-0.03 (Nov 20, 00h10m+-40 m UT). Additionally, the temporal variation of the population index shows a significantly increased value (large fraction of faint meteors) of 2.5+-0.2 at that time. This peak falls about 2.5 h after the predicted encounter time of the 1733 dust trail of the Leonids.

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