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| Titel |
Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
| VerfasserIn |
R. S. Dhillon, T. R. Robinson, T. K. Yeoman |
| 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. 1 ; Nr. 27, no. 1 (2009-01-06), S.65-81 |
| Datensatznummer |
250016356
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| Publikation (Nr.) |
 copernicus.org/angeo-27-65-2009.pdf |
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| Zusammenfassung |
| Previous studies of the aspect sensitivity of heater-enhanced incoherent
radar backscatter in the high-latitude ionosphere have demonstrated the
directional dependence of incoherent scatter signatures corresponding to
artificially excited electrostatic waves, together with consistent
field-aligned signatures that may be related to the presence of artificial
field-aligned irregularities. These earlier high-latitude results have
provided motivation for repeating the investigation in the different
geophysical conditions that obtain in the polar cap ionosphere. The Space
Plasma Exploration by Active Radar (SPEAR) facility is located within the
polar cap and has provided observations of RF-enhanced ion and plasma line
spectra recorded by the EISCAT Svalbard UHF incoherent scatter radar system
(ESR), which is collocated with SPEAR. In this paper, we present
observations of aspect sensitive E- and F-region SPEAR-induced ion and
plasma line enhancements that indicate excitation of both the purely growing
mode and the parametric decay instability, together with sporadic E-layer
results that may indicate the presence of cavitons. We note consistent
enhancements from field-aligned, vertical and also from 5° south of
field-aligned. We attribute the prevalence of vertical scatter to the
importance of the Spitze region, and of that from field-aligned to possible
wave/irregularity coupling. |
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