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Astron. Astrophys. 344, 991-1000 (1999)

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Analysis of the Geminid meteor stream, 1958-1997, from radar observations

P. Pecina and M. imek

Astronomical Institute of the Academy of Sciences of the Czech Republic, CZ-251 65 Ondejov, Czech Republic

Received 16 September 1998 / Accepted 13 January 1999


Results of long-term radar observations of the Geminids in the period 1958-1997 are presented. Mean activity profiles along the Earth's passage through the stream show a systematic change of the peak activity and the width of the stream depending on the distribution of echo durations across the stream. Faint particles are more concentrated in inner orbits while the large ones dominate in the outer orbits. A skewness of the activity profiles is evident for echo durations [FORMULA] s. The patterns of mass-distribution index s and of the flux are also presented. The activity levels of individual years show moderate scatter over the examined period except in 1995 when low activity of the sporadic background results in an apparent high activity of the shower.

Key words: meteors, meteoroids

Send offprint requests to: P. Pecina (ppecina@asu.cas.cz)

© European Southern Observatory (ESO) 1999

Online publication: March 29, 1999