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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Features of Spatial Structure of Tropospheric Response to Solar and Geomagnetic Activity Level Variations Zherebtsov Geliy , Vasilyeva Larisa , Kovalenko Vladimir , Molodyh Sergey Institute of Solar-Terrestrial Physics We have carried out a multifactor correlation analysis of the connection between the heat content of various tropospheric layers and solar (f 10.7 cm) and geomagnetic (AA-index) activity level variations over the period of 1950–2007. To calculate the heat content, we used NCEP/NCAR reanalysis data. We analyzed the influence of volcanoes, El-Nino, and Arctic sea ice area on characteristics of the connection under study. The degree of the connection between tropospheric heat content changes and solar and geomagnetic activity variations was demonstrated to depend essentially on the period of smoothing of time series. When the time scale is increased to 5 years, the correlation coefficient rises considerably (to 0.6–0.7) in most regions. We have found that the heat content correlates with geomagnetic activity in most of the troposphere. But in some regions one can see a significant anticorrelation decreasing with distance from the underlying surface. The tropospheric heat content response to the geomagnetic activity influence is characterized by a significant spatial inhomogeneity which is most pronounced near the underlying surface and considerably changes with height. The spatial structure of the response enlarges with increasing height, and the region of the peak positive response shifts to low latitudes.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Solar Activity Signals on Annual Precipitation Records (1912-2008) from Santa Maria (29°41'S, 53°48'W), Southern Brazil Rampelotto Pabulo Henrique 1 , Rigozo Nivaor Rodolfo 1 , Da Rosa Marcelo Barcellos 2 , Prestes Alan 3 , Souza Echer Mariza Pereira 4 , Nordemann Daniel Jean Roger 4 , Schuch Nelson Jorge 1 , Dal Lago Alisson 1 Southern Regional Space Research Center (CRS/INPE), 2 Federal University of Santa Maria (UFSM), 3 University of Vale do Paraíba (UNIVAP), 4 National Institute for Space Research (INPE), 5 In recent years, there is a great interest in trying to understand and quantify the solar influences on Earth’s climate. However, on the global scale, the correlation between solar activity and meteorological parameters may be positive, negative, or even zero. In this study, we investigate the effects of solar activity (Rz and Rz22) on the rainfall time series (1912 to 2008) from Santa Maria (29°41'S, 53°48'W), Southern Brazil. Classical spectral analysis for rainfall has shown significant periods of 12.3, 21.0 and 82.5. Cross-wavelet between Rz (11yr) and rainfall was significant in the 11 year signal after 1930, but it was intermitted around 1960–1970. Furthermore, it was also observed a high and continuous cross correlation between rainfall and Rz22 (22yr) for the analyzed period. The linear correlation between annual rainfall and solar activity was r < -0.10 for Rz and r = -0.19 for Rz22. These results suggest that, regarding the rainfall variability, minor than 10% can be associated with a linear dependency to 11 year solar cycle and around 19% to 22 year magnetic cycle. Therefore, it is possible that the effect of Hale cycle on climate may be stronger than the Schwabe cycle effect.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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