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| Paper: |
Expansion of Magnetic Flux Concentrations With Height: A Comparison of Hinode SOT Data and MHD Simulations |
| Volume: |
415, The Second Hinode Science Meeting: Beyond Discovery-Toward Understanding |
| Page: |
91 |
| Authors: |
Pietarila, A.; Cameron, R.; Solanki S. |
| Abstract: |
The Hinode SOT (Tsuneta et al. 2008) NFI Na I D1 and SP Fe I data sampled at different positions on the solar disk provide a unique diagnostic for studying the expansion of magnetic flux concentrations with height. We make a comparative study of SOT observations and 2-dimensional (2D) radiative MHD-simulations to see how well the simulations capture the expansion properties. The expansion of flux concentrations is clearly seen in the SOT Na I D1 data, where most of the magnetic features appear unipolar at disk center while close to the limb bipolar appearance strongly dominates. This trend, albeit not as strong, is seen in the SP data as well. Some aspects of the observations are qualitatively reproduced by simulations with a potential (as opposed to vertical) upper boundary condition for the magnetic field. |
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