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| Titel |
Relation between stratospheric sudden warming and the lunar effect on the equatorial electrojet based on Huancayo recordings |
| VerfasserIn |
T. A. Siddiqui, H. Lühr, C. Stolle, J. Park |
| 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 ; 33, no. 2 ; Nr. 33, no. 2 (2015-02-26), S.235-243 |
| Datensatznummer |
250121167
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| Publikation (Nr.) |
 copernicus.org/angeo-33-235-2015.pdf |
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| Zusammenfassung |
| It has been known for many decades that the lunar tidal influence in the
equatorial electrojet (EEJ) is noticeably enhanced during Northern Hemisphere
winters. Recent literature has discussed the role of stratospheric sudden
warming (SSW) events behind the enhancement of lunar tides and the findings
suggest a positive correlation between the lunar tidal amplitude and lower
stratospheric parameters (zonal mean air temperature and zonal mean zonal
wind) during SSW events. The positive correlation raises the question whether
an inverse approach could also be developed which makes it possible to deduce
the occurrence of SSW events before their direct observations (before 1952)
from the amplitude of the lunar tides. This study presents an analysis
technique based on the phase of the semi-monthly lunar tide to determine the
lunar tidal modulation of the EEJ. A statistical
approach using the superposed epoch analysis is also carried out to formulate
a relation between the EEJ tidal amplitude and lower stratospheric
parameters. Using these results, we have estimated a threshold value for the
tidal wave power that could be used to identify years with SSW events from
magnetic field observations. |
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