Abstract
The formation of a current-carrying non-force-free magnetic loop is studied by threedimensional magnetohydrodynamic simulation. The effects of the plasma pressure and the gravitational force are considered for the first time. The results show that the twist motion of the footpoints of magnetic field lines at the photosphere will form magnetic loop in the corona. The magnetic loop expands mainly in both the vertical and horizontal directions along the magnetic neutral line at the photosphere bases.
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