MHD simulation of emerging flux tube in the sun

• Initial State of Simulation

  

  
  
• Evolution of emerging magnetic field

  

  
  
• Comparison to Potential Field

  

  
  
• Current Density Distribution at the Lower Atmosphere
  (Color lines show field lines.)

  

  
  
• 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.)