The 1998 outburst and history of the June Boötid meteor shower

Details The 1998 outburst and history of the June Boötid meteor shower The 1998 outburst and history of the June Boötid meteor shower

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.308..887a&link_type=abstract

Monthly Notices, Volume 308, Issue 3, pp. 887-896.

Physics

9

Scientific paper

The June Boötid meteor shower (sometimes referred to as the Draconids) surprised a number of regular and casual observers by an outburst with maximum zenithal hourly rates (ZHRs) near 100 on 1998 June 27 after a quiescent period of several decades. A total of 1217 June Boötid meteors were recorded during regular visual meteor observations throughout this outburst. An average population index of r=2.2+/-0.10 was derived from 1054 shower magnitude estimates. The broad activity profile with ZHR>40 lasting more than 12h and the large spread of apparent radiants in 1998 resemble the 1916 and 1927 outbursts. The peak time is found to be at about λ_solar=95.7° (2000.0); peak ZHRs are of the order of 200, whereas reliable averages reach only 81+/-7. The period of high ZHRs covered by a single observer implies a full width at half-maximum of 3-4h. The resulting maximum flux of particles causing meteors brighter than +6.5mag is between 0.04 and 0.06km^-2h^-1. The average radiant from photographic, radar and visual records is α=224.12°, δ=+47.77°. The observed activity outbursts in 1916, 1927 and 1998 are not related to the orbital period or the perihelion passages of the parent comet 7P/Pons-Winnecke. These are probably a consequence of the effects of the 2:1 resonance with Jupiter.

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