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| Titel |
Mid-latitude summer response of the middle atmosphere to short-term solar UV changes |
| VerfasserIn |
P. Keckhut |
| 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 ; 13, no. 6 ; Nr. 13, no. 6, S.641-647 |
| Datensatznummer |
250011885
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| Publikation (Nr.) |
 copernicus.org/angeo-13-641-1995.pdf |
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| Zusammenfassung |
| Temperature and wind data obtained with
Rayleigh lidar since 1979 and Russian rockets since 1964 are analyzed to deduce
the summer response of the middle atmosphere to short-term solar UV changes. The
equivalent width of the 1083 nm He I line is used as a proxy to monitor the
short-term UV flux changes. Spectral analyses are performed on 108-day windows
to extract the 27-day component from temperature, wind and solar data sets.
Linear regressions between these spectral harmonics show some significant
correlations around 45 km at mid-latitudes. For large 27-day solar cycles,
amplitudes of 2 K and 6 m s-1 are calculated for temperature data
series over the south of France (44°N), and on wind data series over Volgograd
(49°N), respectively. Cross-spectrum analyses have indicated correlations
between these atmospheric parameters and the solar proxy with a phase lag of
less than 2 days. These statistically correlative results, which provide good
qualitative agreement with numerical simulations, are both obtained at
mid-latitude. However, the observed amplitudes are larger than expected, with
numerical models suggesting that dynamical processes such as equatorial or
gravity waves may be responsible. |
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