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| Titel |
The association of polar mesosphere summer echo layers with tial modes |
| VerfasserIn |
P. J. S. Williams, G. O. L. Jones, J. R. Palmer, H. Rishbeth |
| 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 ; 13, no. 4 ; Nr. 13, no. 4, S.454-457 |
| Datensatznummer |
250011826
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| Publikation (Nr.) |
 copernicus.org/angeo-13-454-1995.pdf |
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| Zusammenfassung |
| The occurrence of PMSEs with time of day
shows a semi-diurnal variation with minima at 8 and 20 h LT. PMSE layers
observed for more than 30 min show an average rate of descent of 2 km h–1.
These characteristics suggest the influence of tidal winds. When the observed
steady wind and diurnal and semi-diurnal tides at EISCAT are added, the overall
magnitude shows a time-variation which matches the occurrence of PMSEs, and the
observed rate of descent, approximately 2 km h–1. Atmospheric gravity
waves also contribute to the velocity of the neutral wind. When the wave
reinforces the background wind, the PMSEs are stronger and descend more rapidly,
but when the wave-related velocity opposes the background wind the PMSE is
weaker and it descends more slowly. |
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