Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....14208m&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #14208
Computer Science
Scientific paper
We present early results of mesospheric waves using the Super Dual Auroral Radar Network (SuperDARN) HF radars at the South African National Antarctic Expedition (SANAE, 71^o40'S,2^o50'W) and Halley (75^o35'S, 26^o34'W), Antarctica. The longitudinal spread of the SuperDARN radars provides an opportunity to study mesospheric dynamics at high latitudes and, in particular, the associated longitudinal differences. At both sites, the observations show a wide spectrum of atmospheric waves ranging from tidal to planetary frequencies. SANAE has a stronger tidal activity with both the diurnal and semidiurnal tides reaching maximum amplitudes of about 20 ms-1 compared to amplitude peaks of about 8 ms-1 at Halley. In general, tidal amplitudes show planetary scale variations that are superimposed on seasonal trends. Part of the planetary modulation of tides is due to non-linear interactions between tides and planetary waves leading to quadratic phase coupling.
Malinga S.
Pinnock Michael
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