Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa51a09p&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA51A-09 INVITED
Physics
3384 Waves And Tides
Scientific paper
The thermosphere and ionosphere region is a strongly coupled and variable environment. We know that the sun is largely responsible for the variability of this region via changes in solar flux and geomagnetic storms. However the thermosphere and ionosphere region is also influenced by the lower atmosphere. Recent studies have indicated that 25% of quiet time ionospheric variability may be due to disturbances propagating into the ionosphere/thermosphere region from below. We know that the migrating atmospheric tides, forced in the troposphere and stratosphere via the absorption of solar radiation by ozone and water vapor, can propagate into the lower thermosphere growing in amplitude with increasing altitude. Once these tides reach the lower-thermosphere dynamo region they can influence the thermosphere by inducing ionospheric currents. Recent studies have shown that the migrating tides do vary significantly on monthly, seasonal and interannual time scales, and can vary longitudinally. This longitudinal variation gives rise to nonmigrating tidal components that can arise from latent heating in the lower atmosphere or nonlinear interaction between planetary waves and the tides. In addition to the tides, large-scale Rossby planetary waves also forced in the lower atmosphere can propagate vertically into the thermosphere/ionosphere environment. These planetary waves, such as the quasi 2,4,10 and 16 days waves, are variable and intermittent, and have been observed in numerous ionospheric measurements. In this talk I will review the current understanding of tidal and planetary wave variability and their effect in the ionosphere/thermosphere environment.
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