Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51c..10m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM51C-10
Other
2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
In one popular paradigm for the development of a magnetic storm, substorm expansions inject ions onto closed drift paths near midnight. These ions drift westward around the earth causing a ground magnetic perturbation that is initially asymmetric with a maximum near dusk. After the ions drift completely around the earth, the current and its perturbation should be symmetric. Thus asymmetry should vanish early in the recovery phase after substorm injection ceases. This paradigm is not supported by observations. The ring current is nearly always asymmetric with the asymmetry index proportional to Dst. We demonstrate this relation with time series plots of Dst and asymmetry, and scatter plots of asymmetry versus Dst in different storm phases. Another paradigm suggests that most of the ground magnetic perturbations are caused by ions convecting through the magnetosphere on open drift paths that pass through the dusk terminator. If this is true, asymmetry should be related to the strength of the convection electric field as parameterized by VBs. We investigate this hypothesis by calculating linear prediction filters that relate both Dst and asymmetry to VBs in the solar wind. We will show that most of the variance in these indices is predictable by the solar wind electric field alone. Because of this it is possible to calculate filters that relate asymmetry to Dst.
McPherron Robert L.
O'Brien Paul
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