Implications of solar flare dynamics for reconnection in magnetospheric substorms

Physics

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Earth Magnetosphere, Magnetic Field Configurations, Magnetic Storms, Solar Activity Effects, Solar Flares, Auroral Electrojets, Auroras, Geomagnetic Tail, H Alpha Line, Solar X-Rays

Scientific paper

Evidence is adduced for the key importance of magnetic reconnection in magnetospheric substorms from observations of two-ribbon solar flares, leading to the inference that reconnection of closed field lines in the near-earth thinned plasma sheet both initiates, and is driven by, the overall MHD instability driving the tailward expulsion of the reconnected closed field. This inference is specifically drawn from observations of filament eruptions in two-ribbon flares, so that it may be concluded that the heart of the overall instability consists of reconnection and eruption of the closed magnetic field in and around the filament. The overall instability in substorms results from essentially the same combination of reconnection and eruption of the closed magnetic field.

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