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| Titel |
Observations of thermosphere and ionosphere changes due to the dissipative 6.5-day wave in the lower thermosphere |
| VerfasserIn |
Q. Gan, J. Yue, L. C. Chang, W. B. Wang, S. D. Zhang, J. Du |
| 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. 7 ; Nr. 33, no. 7 (2015-07-24), S.913-922 |
| Datensatznummer |
250121225
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| Publikation (Nr.) |
 copernicus.org/angeo-33-913-2015.pdf |
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| Zusammenfassung |
| In the current work, temperature and wind data from the
Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED)
satellite during the years 2002–2007 were used to describe the
seasonal variations of the westward propagating 6.5-day planetary
wave in the mesosphere and lower thermosphere (MLT). Thermospheric
composition data from the TIMED satellite and ionospheric total
electron content (TEC) from the International Global Navigation
Satellite System (GNSS) Service were then employed to carry out two
case studies on the effect of this dissipating wave on the
thermosphere/ionosphere. In both cases, there were westward
anomalies of ~ 30–40 m s−1 in zonal wind in the MLT
region that were caused by momentum deposition of the 6.5-day wave,
which had peak activity during equinoxes. The westward zonal wind
anomalies led to extra poleward meridional flows in both
hemispheres. Meanwhile, there were evident overall reductions of
thermospheric column density O / N2 ratio and ionospheric TEC
with magnitudes of up to 16–24 % during these two strong 6.5-day
wave events. Based on the temporal correlation between O / N2
and TEC reductions, as well as the extra poleward meridional
circulations associated with the 6.5-day waves, we conclude that the
dissipative 6.5-day wave in the lower thermosphere can cause changes
in the thermosphere/ionosphere via the mixing effect, similar to the
quasi-two-day wave (QTDW) as predicted by Yue and Wang (2014). |
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