Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa21b1449v&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA21B-1449
Physics
[0629] Electromagnetics / Inverse Scattering, [2442] Ionosphere / Meteor-Trail Physics, [6969] Radio Science / Remote Sensing
Scientific paper
The radar echo from the plasma immediately surrounding the meteoroid, or the head echo, gives us knowledge of size, speed, altitude, and trajectory of the particle. Current models do not account for the observed polarization properties from the radar returns. ALTAIR is a circularly polarized radar that receives in both left and right circular orientations. Most head echoes show primarily the expected polarization for scatter from a sphere. Studying the data sets from ALTAIR we see an important polarization anomaly. In the 2007 experiment, 10% of the 886 VHF head echoes show enough power in the opposite polarization to significantly contribute to the total return signal power. Here we explore a finite difference time domain (FDTD) simulation over a set of overdense meteor two-body fragmentation events. Initial results from these head echo simulations show that these fragmentations can explain the observed polarization anomalies in the ALTAIR data set.
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