Formation of LLBL for Northward IMF

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2407 Auroral Ionosphere (2704), 2463 Plasma Convection (2760), 2704 Auroral Phenomena (2407), 2724 Magnetopause And Boundary Layers, 2760 Plasma Convection (2463)

Scientific paper

The Earth's low-latitude boundary layer contains the solar wind and magnetospheric plasma. When IMF is northward, the LLBL is relatively thick and can be on open or closed magnetic field lines. Global MHD simulations show that magnetic merging at the magnetopause in both hemispheres would yield a thick, closed LLBL. Solar wind plasma previously on open cusp field lines resultant from magnetic merging would enter the LLBL. Plasma convection in the LLBL is antisunward in agreement with in-situ observations. On the other hand, it has been proposed that the LLBL can be formed by plasma diffusion at the magnetopause. In this model, the boundary layer is on closed field lines. Field lines convect sunward from the plasma sheet into the LLBL so that magnetospheric plasma can populate the boundary layer. Wave-particle interaction at the magnetopause is responsible for the entry of solar wind plasma into the LLBL. These results have been confirmed by satellite and radar observations. In this presentation, we will show examples for both cases and attempt to reconcile the merging and diffusion models.

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