Computer Science
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..153c&link_type=abstract
In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed
Computer Science
Meteoroids: Masses
Scientific paper
Meteor data collected at the Kwajalein Missile Range (KMR) during the peak of the 1998 Leonid storm comprise the only simultaneous data collection of meteor head echoes and trails using seven frequencies (VHF, UHF, L-, S-, C-, Ka- and W-band). The primary sensor was the ALTAIR radar operating at 160 MHz with 30-m range resolution and 422 MHz with 7.5-m range resolution, which has both interferometric and polarization capabilities. This paper presents an alaysis of these high-resolution data in support of the following ideas: First, head echo scattering appears to arise from an ionized region with a density sufficiently high that its plasma frequency exceeds the radar frequency (overdense reflection). Second, the Radar-cross-section (RCS) values, which decrease with decreasing wavelength, peak near 105 km altitude at the point where the meteoroid gives up the most kinetic energy during its descent. Third, these RCS measurements were used to compute electron line densities, which provide estimates of a meteoroid's mass. By combining these data and simple ablation models, we can constrain meteoroid mass as it loses material during its passage through the atmosphere.
Close Sigrid
Coster Anthea
Hunt Stephen
McKeen Fred
Oppenheim Meers M.
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