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| Paper: |
Breakout Coronal Mass Ejection or Streamer Blowout: the Bugle Effect |
| Volume: |
429, Numerical Modeling of Space Plasma Flows, Astronum-2009 |
| Page: |
219 |
| Authors: |
van der Holst, B. |
| Abstract: |
This proceedings paper is mostly based on a much longer research paper
van der Holst et al. (2009). We present three-dimensional magnetohydrodynamic
simulations of coronal mass ejections (CMEs) initiated by the breakout
mechanism. The initial steady state solar wind contains a central breakout
arcade with magnetic field lines that are oppositely oriented to the
overarching helmet streamer. This configuration has a magnetic null on the
leading edge of the central breakout arcade. By applying shear flow near the
central polarity inversion line at the coronal base, the field near the null
starts to reconnect and removes the overlying helmet streamer field.
During the erupting, the plasma ahead of the arcade is swept up. The
helmet streamer swells up and the width of the streamer follows a “bugle”
pattern in time. If the streamer swelling is sufficient, the breakout
reconnection will succeed all the way to the top of the helmet streamer,
resulting in a fast breakout CME. |
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