Morten Franz, Rolf Schlichenmaier
Aims: Search for penumbral magnetic fields of opposite polarity, and their correspondence with down-flows. Methods: We use spectropolarimetric HINODE data of a spot very close to disk center, in order to suppress the horizontal velocity components as much as possible. We focus our study on 3-lobe Stokes V profiles. Results: From forward modeling and inversions, we show that 3-lobe profiles testify the presence of opposite magnetic field. They occur predominately in the mid and outer penumbra and are associated with down-flows in the deep layers of the photosphere. Conclusions. Standard magnetograms show that only 4% of the penumbral area harbors magnetic fields of opposite polarity. If 3-lobe profiles are included in the analysis, this number increases to 17%.
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http://arxiv.org/abs/1212.4732
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