Medium-scale travelling ionospheric disturbances and thermospheric winds in the F-region

Details Medium-scale travelling ionospheric disturbances and thermospheric winds in the F-region Medium-scale travelling ionospheric disturbances and thermospheric winds in the F-region

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..697k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 42, Aug. 1980, p. 697-703.

Physics

3

Atmospheric Circulation, F Region, Thermosphere, Traveling Ionospheric Disturbances, Gravity Waves, Internal Waves, Wave Dispersion

Scientific paper

The results of an experimental investigation of the dynamics of medium-scale travelling ionospheric disturbances (TID) are presented and the properties of TID behavior in the F-region and their connection with thermospheric winds, are considered. Observations of medium-scale TID were conducted from January 1975 to May 1976 and the results obtained refer to the daytime F2-layer. In the analysis, data on the magnitude and azimuth of the horizontal trace velocity, the period and the wave spectra of medium-scale TID have been used. It is shown that thermospheric winds give rise to filtering of medium-scale TID in their respective directions, the drift directions of disturbances being oriented along the neutral winds and directed opposite to the wind direction. The limiting observed period of medium-scale TID is essentially affected by thermospheric winds. No systematic dispersion of ionospheric waves predicted by Hines' theory, was detected but this does not invalidate the suggestion that internal gravity waves are responsible for the appearance of medium-scale TID.

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