Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..135t&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 42, no. 2, p. 135-140
Astronomy and Astrophysics
Astronomy
10
High Speed, Hyperbolic Trajectories, Meteoroids, Orbits, Radar Astronomy, Radar Echoes, Spatial Distribution, Astronomical Models, Data Bases, Fresnel Diffraction, Sky Surveys (Astronomy), Time Lag
Scientific paper
The Christchurch (New Zealand) meteor radar AMOR (Advanced Meteor Orbit Radar) has yielded about 1% of meteoroids having an atmospheric speed in excess of 100 km/s. This indicates an influx of particles that is well above the heliocentric parabolic limit for closed orbits. The evidence for these extremely high Earth-encounter speeds comes from meteor echo timing and ionization height characteristics. It is shown that aliasing association with a finite radar sampling rate imposes an upper limit on the atmospheric speeds avaliable from echo diffraction characteristics. The possibility of an interstellar source as evidenced by the heliocentric radiant distribution is discussed.
Baggaley William J.
Bennett G. T. R.
Steel D. I.
Taylor Andrew D.
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