Physics
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.495..381m&link_type=abstract
In: Proceedings of the Meteoroids 2001 Conference, 6 - 10 August 2001, Kiruna, Sweden. Ed.: Barbara Warmbein. ESA SP-495, Noordw
Physics
Upper Atmosphere Winds, Meteor Radar
Scientific paper
The AMOR meteor orbit radar operated near Banks Peninsula on the South Island of Zew Zealand (172°39'E, 43°34'S) has recently been extended to enable wind measurements in the upper mesosphere and lower thermosphere. As the meteoroid encounters the increasing density of the Earth's atmosphere it ablates and leaves a train of ionisation. Radar signals reflecting from this windblown train are Doppler shifted and a line of sight wind measurement is made. A dual interferometer enables the height of the wind measurement to be determined to within 1 km. Hence a detailed vertical profile of motion in the meteor region is obtained. This paper details the meteor radar method of wind measurement. The analysis presented includes a time series analysis of the AMOR winds data for the period May 1997 to June 1999. Results include a strong 12-hour semidiurnal tide as well as occasional longer period planetary waves. It is also shown that the amplitude of the supposedly significant 8 hour terdiurnal tide is exaggerated due to the combination of a large semidiurnal tide and diurnal sampling.
Baggaley William J.
Marsh S. H.
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