Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..677w&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 6, p. 677-685.
Other
16
Interplanetary Medium, Meteoroid Showers, Perseid Meteoroids, Radar Data, Comets, Data Reduction, Mass Distribution
Scientific paper
A prominent activity of the 1991 Perseid meteor shower was detected from 1440 UT through 1640 UT on August 12 by radar observation. There were two peaks during this activity: one at around 1450 UT, and the other at around 1610 UT. The latter was the most active peak, which corresponded to solar longitude 138.9 deg (equinox 1950.0). This activity was different from the regular maximum of the Perseids at the solar longitude 139.2 deg (equinox 1950.0). The enhancement of meteoroid flux, compared with the mean Perseid flux, was 3.4 +/- 0.9 on the average for 2 hr, and 4.9 +/- 1.2 at the most active peak. This indicates that the peak influx rate of the meteoroids of this activity was 3.4 +/- 0.8 times as much as that at the time of the regular maximum of the Perseids. The flattened distribution of the signal power of meteor echoes suggests a smaller mass index, namely one that was richer in larger meteoroids than usual.
Nakamura Takuji
Tsuda Toshitaka
Tsutsumi Masaki
Watanabe Jun'ichi
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