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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Solar UV and the predictability of climatic zonation Vita-Finzi Claudio Natural History Museum London UV emission fluctuates much more markedly than the rest of the irradiance spectrum over the ~11 year (Schwabe) cycle and it triggers temporary shifts in components of the global circulation, including the Hadley cells, the jet streams and the intertropical convergence zone. Better understanding of the origins of this and other UV periodicities thus offers scope for improved forecasting of terrestrial and space weather. For example, a 27-day effect which is conventionally attributed to the Sun’s rotation, and hence viewed as primarily a photospheric effect, may in fact derive primarily from steady rotation of the Sun’s radiative zone rather than the vagaries of sunspot and facula distribution. In addition, advances in the analysis of cosmogenic isotopes reveals cumulative effects which overshadow more flamboyant but shortlived events. Thus the 14 C and 10 Be evidence of ice cores and marine sediments appears to indicate a progressive increase in solar irradiance over the last 30,000 years which was repeatedly subject to century-scale reversals, including the Maunder Minimum, and which, like the Schwabe, may be manifested in the disposition of the atmospheric circulation rather than in a mean global temperature. As the 27-day signal shows, fossil and documentary records of UV fluctuations may in turn serve as windows into the solar interior.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The Study of Atmospheric Gravity Waves and Travelling Ionospheric Disturbances using EISCAT Svalbard Radar IPY-data Vlasov Alexey 1 , Kauristie Kirsti 2 , Pogoreltsev Alexander 1 1 Russian State Hydrometeorological University, 2 Finnish Meteorological Institute Internal Atmospheric Gravity Waves (AGW) play an important role in upper and middle atmospheric dynamics. Such waves can propogate far away from their origin up to hundreds of kilometers verticaly and many thousands of kilometers horizontaly. AGW are also known for causing Traveling Ionspheric Disturbances (TID) when they reach ionosphere. Already for couple of decades Incoherent Scatter Radars (ISR) have been successfully used in AGW/TID studies. A big step forward in ISR measurements was made when EISCAT Svalbard Radar (ESR) was operated allmost continuosly for a whole one year period within the “International Polar Year” (IPY) programme. It has been found that AGW/TID is common phenomenon above ESR especialy during spring and summer. We are going to present the results of our statistical study including annual and duirnal variability of AGW/TID occurance frequency and parameters (especially, periods and amplitudes). The impact of geomagnetic activity will be also discussed.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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