Physics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rasc...39.2015k&link_type=abstract
Radio Science, Volume 39, Issue 2, CiteID RS2015
Physics
6
Ionosphere: Ionospheric Disturbances, Planetology: Comets And Small Bodies: Dust, Radio Science: Radar Atmospheric Physics, Radio Science: Radio Wave Propagation
Scientific paper
Meteor radar echoes persist for timescales from 3 ms to several minutes. At the low end, head echoes provide the target while underdense, diffusing charged meteor trains are associated with timescales of several tenths of a second to several tens of seconds. Longer duration trains are less well understood, and a variety of explanations have been put forth. Indeed, a variety of mechanisms probably contribute. In this paper the author shows that a dust-filled, underdense turbulent meteor train yielded a VHF meteor which lasted over 10 min. Remarkably, the train was also penetrated by a sounding rocket, which verifies the high Schmidt-number nature of the train. Although the turbulence is not yet explained, it is possible that the gravitational sedimentation of the structure provided the free energy via a shear instability of the dusty plasma. These observations further support the notion that meteor trains are associated with dust production and that the double train phenomenon is related to sedimentation of a dusty train.
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