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| Titel |
Characteristics of very large aspect angle E-region coherent echoes at 933 MHz |
| VerfasserIn |
B. J. Jackel, D. R. Moorcroft, K. Schlegel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 15, no. 1 ; Nr. 15, no. 1, S.54-62 |
| Datensatznummer |
250012573
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| Publikation (Nr.) |
 copernicus.org/angeo-15-54-1997.pdf |
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| Zusammenfassung |
| 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 μs 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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