Bulletin 19 of the International Leonid Watch: Population index study of the 2002 Leonid meteors

Details Bulletin 19 of the International Leonid Watch: Population index study of the 2002 Leonid meteors Bulletin 19 of the International Leonid Watch: Population index study of the 2002 Leonid meteors

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jimo...31...77a&link_type=abstract

WGN, Journal of the International Meteor Organization, vol. 31, no.3, p.77-87

Physics

7

Scientific paper

In this part of a series of global analyses of the Leonid meteor storms, the population index r of the 2002 shower is investigated. Details of the determination of the population index and conversion tables for easy r-estimates and their error margins are given. The study is based on the magnitude distributions with 47345 Leonids recorded by 195 observers. A dependence of the population index on the radiant elevation is indicated, but no clear trend was found after scrutiny of the problem. A final profile is presented based on magnitude distributions with radiant heights no lower than 55 deg. A background level of r=1.9 between solar longitudes 236 deg and 237 deg is superimposed by two maxima of r=2.5+-0.1 and r=3.4+-0.3 at solar longitudes 236.62 - 236.65 deg (November 19, 04:15-05:00 UT) and 236.87 deg (November 19, 10:12+-10 min UT). These peaks are associated with the encounter of the 7-revolution and 4-revolution dust trails, respectively. The r-values convert to mass indices of s=1.9+-0.05 and s=2.3+-0.1, respectively. The paper presents perception characteristics of 90 long-term observers which are specially applicable to data obtained under poor observing conditions.

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