On the seasonal variation of absorption of radio waves in the equatorial ionosphere

Details On the seasonal variation of absorption of radio waves in the equatorial ionosphere On the seasonal variation of absorption of radio waves in the equatorial ionosphere

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..793o&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 40, July 1978, p. 793-798. Research supported by the Nigerian External Tel

Physics

1

Annual Variations, Atmospheric Attenuation, Equatorial Atmosphere, Ionospheric Propagation, Radio Attenuation, Anomalies, Atmospheric Circulation, Ionospheric Electron Density, Solar Flux, Temperature Effects, Zenith

Scientific paper

Seasonal variation of absorption of radio waves in the equatorial ionosphere has been examined in relation to corresponding variation of electron density, solar flux, solar zenith angle, temperature and winds. It has been found that absorption and electron density have similar seasonal variation in the height range spanning the upper D-region to the F-region and that seasonal variation of absorption is well correlated with that of 1-8 A flux, particularly at a fixed zenith angle. On the other hand seasonal variation of absorption has been found to be poorly correlated with temperature variation in the stratosphere and winds variation in the lower E-region. It is inferred that the seasonal variation of equatorial absorption, including the seasonal anomaly, can be attributed mainly to changes in the ionizing solar flux and seasonal variation of the solar zenith angle but not to stratospheric-ionospheric coupling nor circulation in the lower E-region.

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