Physics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43.1065j&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 43, Oct. 1981, p. 1065-1069.
Physics
2
Echoes, Gyrofrequency, Ionospheric Disturbances, Sporadic E Layer, Atmospheric Models, Coupled Modes, Ionograms
Scientific paper
Generation and properties of ionospheric gyroechoes in the presence of a thin sporadic E-layer are investigated theoretically. Full wave analysis is used to calculate the transmission coefficients of model Es-layers. The intensification of the echo and the decrease in its virtual height at the onset of the Es-layer are explained in terms of mode coupling, the phenomena of which are shown to be more complicated than expected by Ellis (1960). A mechanism is also found of producing gyroechoes when an otherwise totally blanketing flat type Es-layer is present. When the maximum plasma frequency is so high that the whistler mode can propagate within the Es-layer at frequencies relevant to the gyroecho, the layer may be transparent for the extraordinary mode. Penetration of the ordinary wave becomes impossible, and the 0X0-reflection and ordinary F-trace can no longer be registered. Thus, the gyrotrace may be caused by the XXX-reflection only, and the resulting polarization on the ground is extraordinary.
Jalonen L.
Nygrén T.
Turunen Tauno
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