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| Titel |
Effects of high-latitude atmospheric gravity wave disturbances on artificial HF radar backscatter |
| VerfasserIn |
A. Senior, M. J. Kosch, T. K. Yeoman, M. T. Rietveld, I. W. McCrea |
| 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 ; 24, no. 9 ; Nr. 24, no. 9 (2006-09-20), S.2347-2361 |
| Datensatznummer |
250015631
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| Publikation (Nr.) |
 copernicus.org/angeo-24-2347-2006.pdf |
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| Zusammenfassung |
| Observations of HF radar backscatter from artificial field-aligned
irregularities in an ionosphere perturbed by travelling disturbances due to
atmospheric gravity waves are presented. Some features of the spatio-temporal
structure of the artificial radar backscatter can be explained in terms of
the distortion of the ionosphere resulting from the travelling disturbances.
The distorted ionosphere can allow the HF pump wave to access upper-hybrid
resonance at larger distances from the transmitter than are normally observed
and can also prevent the pump wave reaching this resonance at close
distances. The variation in altitude of the irregularities sometimes results
in a significant variation in the elevation angle of arrival of the
backscattered signal at the radar implying that the radar "sees" a target
moving in altitude. We suggest that this may be evidence of off-orthogonal
scattering from the irregularities. |
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