Position of the Ring Current Peak During ICME- and CIR-Driven Storms

Details Position of the Ring Current Peak During ICME- and CIR-Driven Storms Position of the Ring Current Peak During ICME- and CIR-Driven Storms

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm33d..07j&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM33D-07

Physics

2764 Plasma Sheet, 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Under appropriate solar wind driving during the main phase of a storm, the peak of the ring current (as deduced from ENA observations) can move past midnight towards early morning magnetic local times. Several mechanisms explaining this dawnward shift have been proposed, including the deformation of the convection electric field due to the shielding electric field, and the local time dependence of the plasma sheet density. We present a study of all Dst storms during the IMAGE mission (2000-2005) for which below 80 keV hydrogen ENA remote sensing ring current data are available. We expand previous investigations in several areas. In addition to all ICME-driven events we also include all CIR-driven storms. The relevant (and sufficient) solar wind driving may occur in either event type. We discuss the coupling between solar wind and magnetosphere in more detail, also considering the magnetospheric state prior to storm main phase. This will better represent the role of the plasma sheet in the control of the storm time ring current peak position. Furthermore, we include a comparison of ENA-based results with ground-based magnetometer observations of the ring current morphology for a select number of cases. This provides ground truth for studies previously based on remote- sensing ENA observations alone.

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