Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..785s&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 10, p. 785-791.
Physics
Auroral Zones, E Region, F Region, Ionograms, Ionospheric Electron Density, Ionospheric Propagation, Atmospheric Attenuation, Eiscat Radar System (Europe), Radio Attenuation
Scientific paper
Data from the EISCAT radar and two vertical ionosondes were used to study the slant Es and F-lacuna phenomena in the auroral ionosphere. The threshold effect in both the electric field and in the E-region electron density for the slant Es echoes onset was found and the respective threshold values were estimated as 30 mV/m and 200,000/cu cm. Predictions of slant Es trace shape are made on the basis of EISCAT measurements of ionospheric parameters and a theoretical model of radar aurora signal formation used previously in the VHF band. Satisfactory agreement was found between the model and the experimental ionograms. We present evidence that the F-lacuna phenomenon is associated with at least two effects: a) the defocussing of radio waves during propagation in the disturbed F-region and b) the radio wave absorption during its propagation through the strongly heated, turbulent E-region.
Kustov A. V.
Makarova L. N.
Shirochkov A. V.
Shul'Gina N. V.
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