Abstract
Using a two-dimensional, time-dependent, compressible magnetohydrodynamic simulation, magnetic reconnection driven by an emerging of magnetic flux in a bipolemonopole magnetic field is studied numerically. The results show that an upward cold and dense plasmoid can be formed by reconnection of field lines between bipole and monopole fields. The evolution of magnetic field leads to a whip configuration. The upward plasmoid falls and diffuses after reaching its maximum height. The maximum of plasmoid velocity reaches 0.14 VA and the maximum of upward plasma velocity is about 0.27 VA, where VA is the Alfven velocity at bottom boundary. The upward velocity of plasmoid increases and the process of magnetic reconnection becomes faster when the amplitude of the emerging magnetic flux increases. The density enhancement in plasmoid is larger for smaller background plasma βI (βI is the ratio between plasma and magnetic pressures). The effects of magnetic Lundquist number S between 103—106 on plasma velocity and density enhancement are not obvious. When compared with spontaneous reconnection caused by the resistive tearing instability, the emerging of magnetic flux is more e ective to drive magnetic reconnection in bipole-monopole field and leads the formation of Hα surges and X ray jets in the corona.
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