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| Titel |
A remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause region |
| VerfasserIn |
N. Venkateswara Rao, T. Tsuda, Y. Kawatani |
| 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 ; 30, no. 4 ; Nr. 30, no. 4 (2012-04-19), S.703-710 |
| Datensatznummer |
250017214
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| Publikation (Nr.) |
 copernicus.org/angeo-30-703-2012.pdf |
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| Zusammenfassung |
| The variability of zonal winds and the horizontal wind velocity variance of
short period (20–120 min) gravity waves (GWs) in the equatorial mesopause
region are studied using medium frequency (MF) radar observations from
Pameungpeuk (7.4° S, 107.4° E) during 2004–2010. The zonal winds
display a distinct semiannual oscillation (called mesospheric semiannual
oscillation, MSAO), with westward winds during equinoxes and eastward winds
during solstices. Furthermore, the westward winds during March equinox are
larger during 2008 and 2009. The short period GW variance also shows a
semiannual oscillation with enhanced activity during equinoxes. A good
correlation is observed between the zonal winds and the short period GW
variance from 2008–2010, with the winds being westward during the times of
enhanced GW activity. Such a correlation, however, is less obvious during
2004–2006. The long period (10–20 h) GW variance, on the other hand, does
not show such a correlation throughout the observation period. |
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