Three-dimensional radar observation of a submillimeter meteoroid fragmentation

Details Three-dimensional radar observation of a submillimeter meteoroid fragmentation Three-dimensional radar observation of a submillimeter meteoroid fragmentation

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3504101k&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 4, CiteID L04101

Other

13

Planetary Sciences: Solar System Objects: Meteors, Planetary Sciences: Solar System Objects: Instruments And Techniques, Planetary Sciences: Solar System Objects: Dust, Planetary Sciences: Comets And Small Bodies: Dust, Radio Science: General Or Miscellaneous

Scientific paper

We present and discuss two examples of pulsating meteor events observed with the tristatic 930 MHz EISCAT UHF radar system. One of them provides the first strong observational evidence of a submillimeter-sized meteoroid breaking apart into two distinct fragments. The received power fluctuates regularly in the time profiles of all three receivers, but the fluctuation frequencies are different. The pulsations are interpreted as being due to interference from two distinct scattering centers and the three detected pulsation rates are utilized to calculate the differential velocity of the fragments. The result is consistent with interference from two fragments of unequal cross-sectional area over mass ratio, separating from each other due to different deceleration along the trajectory of their parent meteoroid. The other meteor event is an example of a meteoroid undergoing quasi-continuous disintegration. This manifests itself as simultaneous pulsations at all three receivers. Both observations indicate a head echo target upper size limit of the order of half the 32 cm radar wavelength.

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