Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jimo...26..239a&link_type=abstract
WGN, Journal of the International Meteor Organization, vol. 26, no. 6, p. 239-248
Other
16
Scientific paper
An overview of the 1998 Leonid activity is given based on visual records from 217 observers who saw more than 47000 Leonids in 858 observing hours. A broad component rich in bright meteors (background component) was found to have its maximum at lambda=234.52 (eq. J2000; 1998 November 17, 1h40m UT) with ZHR=340+-20. The actual "storm" component of the Leonid meteoroid stream turned out to be weak in 1998 with a peak at lambda=235.308 (1998 November 17, 20h30m UT) reaching ZHR=180+-20. The first component is characterized by an extremely low population index of r=1.19+-0.02 at lambda=234.43 (1998 November 16, 23h30m UT), whereas relatively high values of r=2.00+-0.05 are found between lambda=235.15 and lambda=235.32 (1998 November 17, 16h40m - 20h50m UT). The full width at half maximum of the background component is 17 hours, that of the "storm" component is 0.75 hours. The data indicate a strong dependence of observable rates from the zenith distance through other than geometrical effects.
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