On the relationship between meteor height and ambipolar diffusion

Details On the relationship between meteor height and ambipolar diffusion On the relationship between meteor height and ambipolar diffusion

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..899g&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 11, p. 899-906.

Physics

5

Meteoroids, Radar Meteors, Ambipolar Diffusion, Geomagnetic Field

Scientific paper

A large data set provided by the Advanced Meteor Orbit Radar (AMOR) is used to obtain discrete measurements of ambipolar diffusion (Da) in the upper atmosphere (70-120km). AMOR has a number of advantages over previous systems. These include a tristatic setup which allows up to three diffusion measurements from a single meteor record, independent height and elevation measurements, and a large fairly continuous data set spanning a number of years. In the period 1995-1999~3×105 individual meteor echoes were found to satisfy rigorous criteria for ambipolar diffusion measurement. A summary is provided of the diffusion measurement method (including the necessary data filtration process) that has been applied. At a given height meteors with a wide range of Da values are observed. The trend of increasing ambipolar diffusion coefficient (Da) with height (h) is explored and found to be best described by h=4.43logDa+87.9km. The influence of the Earth's geomagnetic field on the diffusion rate is also explored. This is found to be too small to be detected, even though current theory predicts a large change in Da with echo elevation angle: anomalous cross-field diffusion is suggested as the reason for this.

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