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| Titel |
Diurnal variation of short-period (20–120 min) gravity waves in the equatorial Mesosphere and Lower Thermosphere and its relation to deep tropical convection |
| VerfasserIn |
N. Venkateswara Rao, Y. Shibagaki, T. Tsuda |
| 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 ; 29, no. 4 ; Nr. 29, no. 4 (2011-04-01), S.623-629 |
| Datensatznummer |
250016998
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| Publikation (Nr.) |
 copernicus.org/angeo-29-623-2011.pdf |
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| Zusammenfassung |
| We study short period gravity waves (20–120 min) in the equatorial
Mesosphere and Lower Thermosphere (MLT) using a Medium Frequency (MF) radar
at Pameungpeuk (7.4° S, 107.4° E), Indonesia. In particular, we study
local time and seasonal variation of the gravity wave variance and its
relation to tropical convection. The gravity wave variance at 88 km enhances
between 20:00 LT and 07:00 LT, with a peak at 02:00–03:00 LT. The enhancement is mainly
observed during February–April and September–October and shows inter-annual
variability. Convective activity over the same location persists from 16:00–21:00 LT
with a peak activity ~18:00 LT and enhances between November–April.
Time delay between the peak of convection and that of gravity wave activity
ranges 1–15 h, which is consistent with theoretical calculations and
previous reports based on reverse ray tracing analysis. |
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