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| Titel |
Bottom-type scattering layers and equatorial spread F |
| VerfasserIn |
D. L. Hysell, J. Chun, J. L. Chau |
| 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 ; 22, no. 12 ; Nr. 22, no. 12 (2004-12-22), S.4061-4069 |
| Datensatznummer |
250015073
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| Publikation (Nr.) |
 copernicus.org/angeo-22-4061-2004.pdf |
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| Zusammenfassung |
Jicamarca radar observations of bottom-type coherent scattering layers
in the post-sunset bottomside F-region ionosphere are presented
and analyzed. The morphology of the primary waves seen in radar
images of the layers supports the hypothesis of
kudeki+bhattacharyya-1999 that wind-driven gradient drift
instabilities are operating. In one layer event when topside
spread F did not occur, irregularities were distributed
uniformly in space throughout the layers. In another event when
topside spread F did eventually occur, the irregularities within
the pre-existing bottom-type layers were horizontally clustered, with
clusters separated by about 30km. The same horizontal periodicity was
evident in the radar plumes and large-scale irregularities that
emerged later in the event. We surmise that horizontal periodicity in
bottom-type layer irregularity distribution is indicative of
large-scale horizontal waves in the bottomside F-region that may
serve as seed waves for large-scale Rayleigh Taylor
instabilities.
Key words. Ionosphere (equatorial ionosphere; ionospheric
irregularties; plasma waves and instabilities) |
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