Three-dimensional disruption of coronal arcade fields by an emerging flux tube
S.Notoya,T.Yokoyama,K.Kusano,T.Sakurai,T.Miyagoshi,H.Isobe,T.Yamamoto
We present the results of three-dimensional numerical MHD simulations designed to model the
process of the eruption in the corona. For the initial state, we prescribe an atmosphere
that comprises a convective zone, photosphere, transition region, and corona.
As a model of magnetic fields, we locate the flux tube that is uniformly twisted
in the convective zone, and the arcade fields that are sheared relative
to the magnetic neutral line in the corona.
In our simulations, the emerging flux triggers the eruption in the following way.
First, the flux tube embedded in the convective zone moves upward when perturbed,
and reaches the photosphere, and then expands to the corona by the magnetic buoyancy.
In the process of the expansion, the coronal arcade fields are strongly deformed by
the magnetic pressure of the emerging flux, and the current sheets are made inside the
arcade fields. Then reconnection process of the arcades begins and generates strong
upward motions of the reconnected field lines of the arcades.
Our results suggest that emerging flux may initiate a coronal mass ejection.
Correspondence
Shun Notoya (notoya@eps.s.u-tokyo.ac.jp), University of Tokyo
presentation
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