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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Possible role of internal climatic oscillation in the relationship between Sun and cloud cover Voiculescu Mirela 1 , Usoskin Ilya 2 1 Department of Physics, "Dunarea de Jos" University of Galati, Romania, 2 Sodankylä Geophysical Observatory (Oulu unit), 90014 University of Oulu, Finland During the last decade accumulating statistical evidence of solar effects on climate has emerged. Significant global correlations between different types of cloud cover and ultraviolet irradiance (UVI), and respectively cosmic ray induced ionization (CRII) have been found. In our previous work we have shown that different solar drivers play different roles in the occurrence of clouds at different altitudes. Since clouds play an important role in climate changes as a major contributor to the Earth’s radiation budget, it is important to study as thoroughly as possible the degree of correlation and the background conditions when such a correlation must be taken into account when evaluating the climate change. Among these we focus on the possible link between ultraviolet irradiance (UVI) or cosmic ray induced ionization (CRII), and low or high clouds, respectively. Because of some variability modes in teleconnection indices (e.g., NAO) which are close to the solar 11-yr cycle, they can interfere in the climate response. We investigate here the possibility that the observed link in the complicated chain that relates Sun and climate could be a mixed relationship between teleconnection indices (NAO), cloud cover and solar variability (CR or UVI based).
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The ionospheric trough and associated ionosphere-magnetosphere coupling, possible indicator of space weather status Voiculescu Mirela 1 , Nygren Tuomo 2 1 2 Department of Physics, "Dunarea de Jos" University, Galati, Romania, Department of Physics, University of Oulu, Finland There are ionospheric phenomena that can be the result of the coupling between near Earth plasmas. One of these is the density depletion occurring in the F region, known as the ionospheric trough. Using satellite and ground based data some different types of troughs have been selected for a thorough analysis of their characteristics. We have chosen those ionospheric troughs where experimental results are available from more than a single instrument. This allows a detailed investigation of electron density, plasma temperatures and ion drifts within the trough and its neighborhood. Moreover, data from the top ionosphere and from the inner magnetosphere based on in situ observations or empirical and/or physical models are used for identifying specific background conditions (convection electric fields, IMF structure) with different types of troughs, and, consequently, contribute to a better understanding of the formation and evolution of the trough.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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