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| Titel |
Variabilities of mesospheric tides and equatorial electrojet strength during major stratospheric warming events |
| VerfasserIn |
S. Sridharan, S. Sathishkumar, S. Gurubaran |
| 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 ; 27, no. 11 ; Nr. 27, no. 11 (2009-11-04), S.4125-4130 |
| Datensatznummer |
250016697
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4125-2009.pdf |
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| Zusammenfassung |
| The present study demonstrates the relationship between the high latitude
northern hemispheric major sudden stratospheric warming (SSW) events and the
reversal in the afternoon equatorial electrojet (EEJ), often called the
counter-electrojet (CEJ), during the winter months of 1998–1999, 2001–2002,
2003–2004 and 2005–2006. As the EEJ current system is driven by tidal winds,
an investigation of tidal variabilities in the MF radar observed zonal winds
during the winters of 1998–1999 and 2005–2006 at 88 km over Tirunelveli, a
site close to the magnetic equator, shows that there is an enhancement of
semi-diurnal tidal amplitude during the days of a major SSW event and a
suppression of the same immediately after the event. The significance of the
present results lies in demonstrating the latitudinal coupling between the
high latitude SSW phenomenon and the equatorial ionospheric current system
with clear evidence for major SSW events influencing the day-to-day
variability of the CEJ. |
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