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The decadal-scale variation of solar Lyman-α and its effects on NLC occurrence rate, NLC brightness and the mesospheric water vapor

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Recent 3-D modelling of water vapor in the mesosphere and of NLC volume backscatter coefficient has shown that both parameters are much less influenced by changes in solar Lyman- flux than hitherto assumed. Long-term satellite observations of seasonally averaged NLC albedo support the finding of a reduced response of NLC brightness to changes in solar Lyman- flux. At the same time, the observed variation of average NLC brightness (by SBUV and lidar experiments) throughout a solar cycle is somewhat larger than modelled under the assumption that photodissociation of HO by Lyman- is the sole source for the NLC variation. This necessitates to search for additional sources of variability in NLC parameter.

Neuere Arbeiten unter Benutzung von 3-D Atmosphären-Modellen zeigen, dass der Einfluss der solaren Lyman-α Strahlung auf den mesosphärischen Wasserdampf und die optischen Eigenschaften leuchtender Nachtwolken (NLC) nicht so groß sein sollte wie bisher angenommen. Diese Vorhersage wird durch langzeitige Beobachtung der mittleren NLC-Helligkeit mittels Satelliten und bodengestützten Lidarmessungen generell bestätigt. Jedoch sind die modellierten NLC-Variationen nunmehr kleiner als die beobachteten. Die solare Aktivität scheint daher mit mehr als nur der Variation des Lyman-α-Flusses auf die NLC-Parameter einzuwirken.
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Document Type: Research Article

Publication date: 01 June 2006

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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