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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Solar Activity Signals on Centennial Temperature Time Series 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 4 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) Many attempts have been made to connect climatic changes with variation in solar activity parameters, which has showed increased levels at the present compared with the Maunder Minimum period. In this study we investigate the possible effects of solar activity (Rz and Rz22) on the surface air temperature (1912 to 2008) from Santa Maria (29°41'S, 53°48'W), Southern Brazil. Classical spectral analysis for temperature has shown significant periods of 11.8, 19.1 and 64.3. Cross-wavelet between Rz (11yr) and temperature was significant in the 11 year signal after 1935, but it was weak around 1970–1980. Furthermore, it was also observed a high and continuous cross correlation between temperature and Rz22 (22yr) for the analyzed period. The linear correlation between annual temperature and solar activity was r < -0.10 for Rz and r = -0.19 for Rz22. These results suggest that, regarding the temperature 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.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Electromagnetic signatures inside the ionospheric equatorial plasma bubble: CHAMP observation and theoretical framework. Kherani Esfhan The equatorial ionospheric F region often becomes unstable during evening-time and gives rise to large plasma depletion or plasma bubble. In this work, CHAMP observations of electromagnetic fluctuations inside the plasma bubbles will be presented. To study the possible cause for these fluctuations, hydro-magnetic framework is adopted where growth equation for polarization electric field and density fluctuation will be derived. To excite the magnetic fluctuation inside the plasma bubble, the possible contribution from current driven by polarization electric field and density gradient will be examined.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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