Vector Spectropolarimetry of Darkcored Penumbral Filaments with Hinode

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Vector Spectropolarimetry of Dark-cored Penumbral
Filaments with Hinode

• Bellot Rubio
• ApJL, 2007, in press

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BBSO High Resolution Observation

• Non-uniformity in sunspot penumbra
• The special term was defined by Scharmer et al.,
  2002

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Physics

• Manifestation of Magnetic Flux Tubes (Sutterlin
  et al., 2004, Borrero 2007)
• Field-Free gaps (Spruit Scharmer, 2006)

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Observing Tool

• Hinode Solar Optical Telescope
• --Spectropolarimeter
• Stokes Q,U,V,I
• Resolution of 0.3

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Comparison of a sunspot near the limb and at disk
center
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Conclusion

• Darker cores are 100-150G weaker
• (are not field free)
• Dark cores are more inclined (4 degrees)
• Strong Evershed flow (6-7 km/s)

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Limitation

• The structure is not fully resolved
• The Stokes inversion is not matured