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| Titel |
Signature of the 27-day solar rotation cycle in mesospheric OH and H2O observed by the Aura Microwave Limb Sounder |
| VerfasserIn |
A. V. Shapiro, E. Rozanov, A. I. Shapiro, S. Wang, T. Egorova, W. Schmutz, Th. Peter |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 7 ; Nr. 12, no. 7 (2012-04-03), S.3181-3188 |
| Datensatznummer |
250011005
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| Publikation (Nr.) |
 copernicus.org/acp-12-3181-2012.pdf |
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| Zusammenfassung |
| The mesospheric hydroxyl radical (OH) is mainly produced by the
water vapor (H2O) photolysis and could be considered as a
proxy for the influence of the solar irradiance variability on the
mesosphere. We analyze the tropical mean response of the mesospheric OH and
H2O data as observed by the Aura Microwave Limb Sounder (MLS)
to 27-day solar variability. The analysis is performed for two time periods
corresponding to the different phases of the 11-yr cycle: from December
2004 to December 2005 (the period of "high activity" with a pronounced
27-day solar cycle) and from August 2008 to August 2009 ("solar minimum"
period with a vague 27-day solar cycle). We demonstrate, for the first time,
that in the mesosphere the daily time series of OH concentrations correlate
well with the solar irradiance (correlation coefficients up to 0.79) at zero
time-lag. At the same time H2O anticorrelates (correlation
coefficients up to −0.74) with the solar irradiance at non-zero time-lag. We
found that the response of OH and H2O to the 27-day
variability of the solar irradiance is strong for the period of the high
solar activity and negligible for the solar minimum conditions. It allows us
to suggest that the 27-day cycle in the solar irradiance and in OH and
H2O are physically connected. |
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