Physics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11406209v&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A6, CiteID A06209
Physics
Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409)
Scientific paper
We present an analysis of the SI characteristics at λ ≈ 36° examining 54 events for a 5-year interval (2000-2004). In the H component, the ground responses are typically greater than expected for changes of the magnetopause current; they are also accompanied by significant changes of the D component. Both these aspects suggest a remarkable, long-lasting contribution of the ionospheric currents on geomagnetic measurements associated with changes of the solar wind pressure. The relative response (i.e., as normalized to the change of the square root of the solar wind pressure) exhibits a local time modulation, with highest values in the afternoon hours for both components. For the H component, the average ratio between the observed and the predicted response is ≈1.5 in the central part of the day and ≈1.2 in the dark sector.
Piersanti M.
Villante Umberto
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