Other
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..549c&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 8, July-Aug. 1990, p. 549-557.
Other
7
Atmospheric Circulation, Earth Ionosphere, Meridional Flow, Wind Profiles, Argentina, Atmospheric Models, Periodic Variations, Solar Activity, Traveling Ionospheric Disturbances
Scientific paper
Thermospheric meridional winds were derived from ionosonde data using the method of Miller et al. (1986, 1987) for three sites over Argentina. A full year of data was analyzed corresponding to the solar minimum of 1984. A tidal analysis of the wind yielded the following results: (1) a similar seasonal trend at the three locations, namely, a maximum diurnal amplitude during the winter solstice and semidiurnal maxima during equinoxes; (2) amplitudes and phases are in relatively good agreement with models currently available for thermosphere dynamics, as well as observational data obtained by other techniques at other sites; and (3) the analysis of the day-to-day variability shows that this is not a random process. Instead, the amplitude changes appear to be oscillatory in nature. Frequency analysis of these oscillations results in frequency bands which could be associated with planetary wave activity in other regions of the middle atmosphere.
Giraldez Alberto Enrique
Osvaldo Canziani Pablo
Teitelbaum Hector
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