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Paper: Coronal Mass Ejection as a Result of Magnetic Helicity Accumulation
Volume: 454, The 3rd Hinode Science Meeting
Page: 399
Authors: Zhang, M.
Abstract: We present our understandings that coronal mass ejections (CMEs) are unavoidable products of magnetic helicity accumulation in the corona. We first show that in an open atmosphere such as the solar corona the total magnetic helicity of a force-free field may be bounded. The accumulation of magnetic helicity in excess of its upper bound would initiate a non-equilibrium situation, resulting in an expulsion such as a CME. We then show that the magnitude of the helicity upper bound of the force-free fields is non-trivially dependent on the boundary condition. This suggests that a coronal magnetic field may erupt into a CME when the applicable helicity bound falls below the already accumulated helicity as the result of a slowly changing boundary condition. Our study gives insights into the underlying physics of CME initiations and their associations with the magnetic features at their surface origins.
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