On the partial transparency of sporadic E-layers at high latitudes

Details On the partial transparency of sporadic E-layers at high latitudes On the partial transparency of sporadic E-layers at high latitudes

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..731j&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, Sept. 1982, p. 731-735.

Physics

1

Coupled Modes, Ionospheric Electron Density, Ionospheric Propagation, Polar Regions, Sporadic E Layer, Transparence, Critical Frequencies, Ionosondes, Plasma Frequencies

Scientific paper

Partial transparency of Es-layers caused by coupling between the characteristic modes of the radio wave is studied theoretically assuming various electron density profiles and recording thresholds of the ionosonde. The results show that mode coupling should be important at high latitudes in Es-layers with steep electron density gradients. An investigation is also made to determine whether the coupling mechanism is observable in standard ionosonde data recorded at Sodankyla, Finland. In most cases the partial transparency can be explained in terms of the cloud model, but at moderately high critical frequencies the experimental distribution of the f0Es-fbEs separations shows features most probably indicating the presence of the coupling mechanism.

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