Systematic forward scatter radar observations of radio waves from meteoroid streams

Details Systematic forward scatter radar observations of radio waves from meteoroid streams Systematic forward scatter radar observations of radio waves from meteoroid streams

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996acm..conf...23c&link_type=abstract

ACM96 Asteroids, Comets, Meteors - COSPAR Colloqium 10, July 8-12 1996, Versailles (France)

Computer Science

Scientific paper

Forward scatter (FS) continuous wave (CW) meteor radar observations carried out during 1992-95 over the long baseline Bologna-Lecce in Italy, enabled us to determine the mass distribution versus duration of particles in main meteoroid streams (Lyrids, eta Aquarids, delta Aquarids, Perseids, Orionids, Leonids, Geminids) and the sporadic background. The unexpected high proportion of short-lived echoes with duration T < 0.2s suggests that the missing mass of meteor particles observed so far by backscatter radars in the 1E-6 - 1E-4 g mass range, is present in the form of faint high-velocity meteors, which ablate above the echo ceiling of conventional radars. The trends of the mass distribution of particles for the quoted meteor complexes are discussed in terms of variation of the mass index s and of steady-state conditions for each meteor population. The combined cumulative distributions of meteor trails vs peak signal amplitudes and vs durations represent a more reliable indicator of the meteoroid stream activity and, consequently, of the mass index variation. The mass index values of the sporadic background are generally higher than for meteor showers in the duration range of 0.1

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