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Titel |
Solar activity forcing of the middle atmosphere |
VerfasserIn |
K. Mohanakumar |
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. 8 ; Nr. 13, no. 8, S.879-885 |
Datensatznummer |
250011962
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Publikation (Nr.) |
copernicus.org/angeo-13-879-1995.pdf |
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Zusammenfassung |
Studies on the influence of solar activity in
11-year cycle on middle atmospheric thermodynamic parameters, such as
temperature, pressure and density, and zonal and meridional wind components over
three meteorological rocket launching stations, located in the tropics (Thumba),
mid-latitude (Volgograd) and high-latitude (Heiss Island) regions of the
northern hemisphere have been carried out. The temperature in all the three
regions showed a negative response in the stratosphere and positive association
in the mesosphere with the changes in solar activity. The temperature decreases
by 2–3% from its mean value in the stratosphere and increases by 4–6% in the
mesosphere for an increase in 100 units of solar radio flux. Atmospheric
pressure is found to be more sensitive to solar changes. An average solar
maximum condition enhances the pressure in the stratosphere by 5% and in the
upper mesosphere by 16–18% compared to the respective mean values. Density also
showed strong association with the changes in solar activity. Increase in the
solar radio flux tends to strengthen winter westerlies in the upper stratosphere
over the mid-latitude and summer easterlies in the middle stratosphere over
tropics. Larger variability in the zonal wind is noted near stratopause height.
Results obtained from the study indicate that there is an external force exerted
on the Earth's atmosphere during the period of high solar activity. These
results can be incorporated for further studies on the dynamics of the middle
atmosphere in association with the changes in solar activity. |
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