Fig. 7.
Magnetic fields of the intruding penumbral filaments and sunspot light bridge. (a1)–(a2): NVST TiO image and SDO/HMI vector magnetogram showing the sunspot penumbral filaments intruding into umbrae at both sides of the light bridge and the corresponding photospheric magnetic fields. (b1)–(b3): enlarged TiO images superimposed by the horizontal magnetic fields (red arrows) calculated by NLFFF extrapolation at the height of z ≃ 0 Mm, z ≃ 0.73 Mm, and z ≃ 1.45 Mm, respectively. c1–c3: corresponding maps of the angle between the vector magnetic field and the horizontal plane.
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