Simulating the ''sliding doors'' effect through magnetic flux emergence |
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David MacTaggart Submitted: 2010-05-28 06:42
Recent Hinode photospheric vector magnetogram observations (Okamoto et al. 2008, 2009) have shown the opposite polarities of a long arcade structure move apart and then come together. In addition to this ''sliding doors'' effect, orientations of horizontal magnetic fields along the polarity inversion line (PIL) on the photosphere evolve from a normal-polarity configuration to an inverse one. To explain this behaviour, a simple cartoon model suggested that it is the result of the emergence of a twisted flux rope. Here we model this scenario using a 3D MHD simulation of a twisted flux rope emerging into a pre-existing overlying arcade. We construct magnetograms from the simulation and compare them with the observations. The model produces the two signatures mentioned above. However, the cause of the ''sliding doors'' effect differs from the previous cartoon model.
Authors: David MacTaggart, Alan Hood
Projects: None
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Publication Status: Accepted by ApJ Letters
Last Modified: 2010-05-29 05:26
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