Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984baicz..35..244l&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 35, Aug. 1984, p. 244-252. Research supported by the
Astronomy and Astrophysics
Astronomy
4
Meteor Trails, Meteoroids, Radar Astronomy, Radar Echoes, Drift Rate, Radial Velocity
Scientific paper
The results of observations of 338 range-variable meteor radar echoes are analyzed. The results show that radial velocities computed from echo range drift are high compared to the prevailing wind velocities in the meteor region, but too low to be explained by the meteors themselves. The mean absolute value of all radial velocities is 1.8 km/s. For 262 echoes associated with the Perseid meteors trail geometry was fully determined and drift velocities along the ionization trail were computed. Ninety percent of the velocities were positive, indicating a downward displacement of the echoing point. The median and mean absolute values of the velocities along the trail were 1.4 km/s and 5.9 km/s, respectively. The analysis shows that drift velocity is inversely proportional to echo duration, and this result is in agreement with theoretical models identifying the rapid diffusion of meteor ionization trails as the primary physical mechanism responsible for range drift phenomena in radio meteor studies.
Hajduk Agnieszka
Lindblad Bertil-Anders
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