Computer Science
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jimo...26...13f&link_type=abstract
WGN, Journal of the International Meteor Organization, vol. 26, no. 1, p. 13-19
Computer Science
Scientific paper
Preliminary results of Leonid radar observations carried out during November 11-19, 1997, by using the forward scatter Bologna-Lecce radar facility in Italy, are presented. As in 1996, the Leonid maximum is incredibly obvious on November 17, with a prominent peak between 7h and 8h UT (exactly, at 7h20m-7h40m UT corresponding to solar longitudes lambda=235.06-235.07, eq. 2000). As a useful diagnostic tool for radio meteor observers, we utilized the enhanced counts for long-duration echoes having T > 16s and T > 64s to compare with the hourly echo profile deduced for T > 1s (corresponding to all overdense meteors). Three activity spikes with peaks around 1h-2h, 3h-4h, and 7h-8h UT (the most prominent peaks), are suggested to occur corresponding to solar longitudes between lambda=234.75 degrees and lambda=235.08 degrees, even if these results based only on raw hourly radio meteor echo counts must be treated with caution because of correction factors and instrumental effects. When comparing the Leonid results of 1996 and 1997, the number of overdense meteors having T > 1s has slightly increased in 1997, mainly in coincidence with the prominent maximum, whereas the number of long-enduring echoes has generally diminished throughout the whole morning. By considering the identical levels of transmitted power (0.25kW) utilized in both years, it is suggested thast the increase in the 1997 rates of the overdense meteors with T > 1s during the time of maximum activity of the shower can be influenced by correction factors (i.e., the lost recording time in each hour due to the system saturation from very long-duration echoes).
Cevolani Giordano
Foschini Luca
Sbenaglia E.
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