Numerical study of line-tied magnetic reconnection

Physics

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Coronal Loops, Magnetoplasmadynamics, Solar Flares, Solar Magnetic Field, Beta Factor, Current Sheets, Lines Of Force, Magnetic Field Configurations, Magnetic Flux, Magnetohydrodynamic Flow, Neutral Currents, Plasma Currents, Plasma Pinch, Shock Waves, Tearing Modes (Plasmas)

Scientific paper

A two-dimensional configuration, analogous to that of the main phase in two-ribbon flares, is numerically modelled by self-consistently solving the time-dependent MHD equations. The initial state consists of a vertical current sheet with an external plasma beta value of 0.1 and a magnetic Reynolds number of 0.001. Many of the principal dynamical features of the main phase in a flare are present, although gravity and a full energy equation are not yet included. The model mostly confirms the general MHD validity of the kinematic Kopp-Pneuman (1976) model for post-flare loops. Stretched field lines at the start of the main phase pinch together near the coronal base to form a neutral line which subsequently rises as field lines close back down to form loops. As the neutral line rises, an inverted Y-type field configuration forms, and slow shocks are created in the region where flare loops are expected to occur. By the end of the computation fast magnetic reconnection has commenced.

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