Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm23b1719r&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM23B-1719
Physics
2162 Solar Cycle Variations (7536), 2169 Solar Wind Sources, 2784 Solar Wind/Magnetosphere Interactions, 7900 Space Weather, 7954 Magnetic Storms (2788)
Scientific paper
Geomagnetic activity is driven by solar wind and interplanetary magnetic field variations and is well represented by the temporal variations in the Geomagnetic storm (Dst) and Ap indices. A study of the temporal oscillations in these activity indices can help in understanding the role of solar wind -magnetosphere coupling on space weather at different temporal scales. These oscillations are quasi- periodic and cannot be studied by conventional Fourier techniques. We, therefore, use the technique of singular spectrum analysis in the present study. 50 years data of Ap and Dst indices are subjected to the analysis. Both daily and monthly mean values of the indices are used to bring out essential characteristics of temporal scales ranging from the solar rotation to solar cycle oscillations. The results of the study are interpreted in terms of the linear and non-linear response of the magnetosphere to solar wind forcing.
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