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| Titel |
Refractive index effects on the scatter volume location and Doppler velocity estimates of ionospheric HF backscatter echoes |
| VerfasserIn |
P. V. Ponomarenko, J.-P. St.-Maurice, C. L. Waters, R. G. Gillies, A. V. Koustov |
| 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 ; 27, no. 11 ; Nr. 27, no. 11 (2009-11-06), S.4207-4219 |
| Datensatznummer |
250016704
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4207-2009.pdf |
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| Zusammenfassung |
| Ionospheric E×B plasma drift velocities derived from the Super
Dual Auroral Radar Network (SuperDARN) Doppler data exhibit systematically
smaller (by 20–30%) magnitudes than those measured by the Defence
Meteorological Satellites Program (DMSP) satellites. A part of the
disagreement was previously attributed to the change in the E/B ratio due
to the altitude difference between the satellite orbit and the location of
the effective scatter volume for the radar signals. Another important factor
arises from the free-space propagation assumption used in converting the
measured Doppler frequency shift into the line-of-sight velocity. In this
work, we have applied numerical ray-tracing to identify the location of the
effective scattering volume of the ionosphere and to estimate the ionospheric
refractive index. The simulations show that the major contribution to the
radar echoes should be provided by the Pedersen and/or escaping rays that are
scattered in the vicinity of the F-layer maximum. This conclusion is
supported by a statistical analysis of the experimental elevation angle data,
which have a signature consistent with scattering from the F-region peak. A
detailed analysis of the simulations has allowed us to propose a simple
velocity correction procedure, which we have successfully tested against the
SuperDARN/DMSP comparison data set. |
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