Role of Saturation of the Polar Cap in Regulating Energy Coupling Efficiency in Magnetic Storms

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2723 Magnetic Reconnection (7526, 7835), 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Energy coupling in magnetic storms is a fundamental issue in magnetospheric physics. While not completely understood, there have been hints regarding coupling mechanisms and their limitations. For example, magnetic storms due to Corotating Interaction Regions (CIRs) have been shown to elicit different responses in the magnetosphere than those prompted by other types of solar wind driving conditions such as CMEs. In particular, CIR-driven storms are more geoefficient, coupling more energy into the magnetosphere- ionosphere system per input energy from the solar wind than storms driven by CMEs. In this work, we present analysis concerning why this is the case. In particular, we show analysis of the role of polar cap saturation in mediating the energy coupling capability of the solar wind to the magnetosphere in storm events. We generalize our findings to all storms regardess of the type of storm driver.

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