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Paper: Bipolar Magnetic Structures in Sunspot Penumbrae
Volume: 454, The 3rd Hinode Science Meeting
Page: 221
Authors: Sainz Dalda, A.; Bellot Rubio, L. R.
Abstract: We present a study of bipolar, sea-serpent-like structures in the penumbra of sunspots. Our analysis is based on longitudinal magnetograms and full Stokes spectra of AR 10923 taken with the NFI and SP instruments of Hinode. The circular polarization maps reveal the presence of many elongated structures in the mid penumbra and beyond. They consist of two opposite-polarity patches that move together as a single entity toward the outer penumbral boundary, where they become moving magnetic features. Their Stokes profiles suggest a complex magnetic topology. The existence of opposite polarities in the penumbra is well known from previous analyses, but this is the first time that their bipolar nature is unveiled. Our observations also demonstrate that they are intimately connected with the Evershed flow. These structures provide new constraints to theoretical and numerical models of sunspots.
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