MHD simulation of emerging flux tube in the sun
- Initial State of Simulation
![](initial_state.jpg)
- Evolution of emerging magnetic field
![](fig4v2.gif)
- Comparison to Potential Field
![](fig5.jpg)
- Current Density Distribution at the Lower Atmosphere
(Color lines show field lines.)
![](fig7.jpg)
- Sigmoid on the Sun
(Top: Sigmoid observed on the sun.
Bottom: Sigmoidal structure reproduced in numerical simulation.
Brightness of field lines reflects the current density distributed at
the footpoint of individual field lines.)
![](sigmoid.gif)