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| Titel |
The small-scale structure of VHF mesospheric summer echo layers observed at mid-latitudes |
| VerfasserIn |
D. A. Hooper, L. Thomas |
| 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. 8 ; Nr. 15, no. 8, S.1037-1047 |
| Datensatznummer |
250012912
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| Publikation (Nr.) |
 copernicus.org/angeo-15-1037-1997.pdf |
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| Zusammenfassung |
| The VHF radar system at Aberystwyth (52.4°
N, 4.1°E) has been used to make high-time-resolution, multi-beam observations
of mesospheric summer echo layers. These show that the altitude and the sense of
vertical movement of the layers can vary over time-scales of minutes and
horizontal scales of kilometres. In general, the altitude profiles of
signal-to-noise ratio provide evidence of a bifurcated structure with sharp
changes in the horizontal wind vector and vertical velocity, and enhanced
spectral width occurring at the bifurcation level. The implications of the
small-scale structure for studies of the aspect sensitivity of radar returns are
discussed, and the changes in wind-field at the bifurcation level are compared
with 'wind corners' observed in rocket studies of the mesosphere at polar
latitudes. |
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