Characteristics of very large aspect angle E-region coherent echoes at 933 MHz |
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| Authors: | B J Jackel D R Moorcroft K Schlegel |
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| Institution: | (1) Department of Physics, University of Western Ontario, London, Ontario, Canada, N6A 3K7;(2) Max-Plank-Institut für Aeronomie, Postfach 20, D-37189 Katlenburg-Lindau, Federal Republic of Germany |
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| Abstract: | The EISCAT UHF radar system was used to study the characteristics of E-region coherent backscatter at very large magnetic aspect angles (5–11°). Data taken using 60  s pulses during elevation scans through horizontally uniform backscatter permitted the use of inversion techniques to determine height profiles of the scattering layer. The layer was always singly peaked, with a mean height of 104 km, and mean thickness (full width at half maximum) of 10 km, both independent of aspect angle. Aspect sensitivities were also estimated, with the Sodankylä-Tromsø link observing 5 dB/degree at aspect angles near 5°, decreasing to 3 dB/degree at 10° aspect angle. Observed coherent phase velocities from all three stations were found to be roughly consistent with LOS measurements of a common E-region phase velocity vector. The E-region phase velocity had the same orientation as the F-region ion drift velocity, but was approximately 50% smaller in magnitude. Spectra were narrow with skewness of about –1 (for negative velocities), increasing slightly with aspect angle. |
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