Physics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jatp...41..379b&link_type=abstract
(European Geophysical Society, Meeting, 5th, Strasbourg, France, Aug. 29-Sept. 1, 1978.) Journal of Atmospheric and Terrestrial
Physics
7
E Region, Gravity Waves, Ionospheric Propagation, Lower Ionosphere, Rossby Regimes, Stratosphere, Vertical Motion, Correlation Coefficients, Coupling, Electron Oscillations, Ionospheric Electron Density, Pressure Distribution, Wind Profiles, Winter
Scientific paper
Earlier work which provided evidence for coupling between pressure variations in the stratosphere and lower ionosphere in winter has been extended. Day-to-day changes in the height of fixed electron density isopleths in the E-region at a middle latitude often exhibit quasi-oscillations with amplitudes between 2 and 10 km, and periods between 5 and 30 days. It is found that the correlation between these oscillations and corresponding variations in the height of winter isobaric surfaces in the stratosphere, resulting from the presence of planetary-scale waves, is sometimes good and sometimes poor. Examination of the type of wave disturbance in the stratosphere and of the stratospheric zonal wind profiles suggests that the conditions for stratosphere-ionosphere coupling are met only when well-defined planetary waves of increasing amplitude with height are seen in the lower stratosphere and when the stratospheric zonal wind pattern is favourable to the vertical propagation of such waves.
Brown Michael G.
John J. I.
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