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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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