Electric currents, temperature enhancements, and Joule heating in the sunspot LB. Panels 1a–1d: spatial distribution of the vertical current density J_z and horizontal current density J_hor at z = 0.36 Mm (top) and z = 0.72 Mm (bottom). The horizontal lines in panel 1b indicate the locations of the 2D cuts shown in Fig. 4. The white horizontal line marks cut No. 5 used in Figs. 4g and h. Panels 2a–2b: spatial distribution of the vertical (top) and horizontal (bottom) component of the magnetic field at z = 0.36 Mm. Panels 2c–2d: spatial distribution of the NLTE temperature at z = 0.36 Mm (top) and z = 0.72 Mm (bottom). The white rectangle in panel 2c is a smaller FOV centered on the LB shown in Fig. 3. Panels 3a–3d and 4a–4d: spatial distribution of J_||, J_⊥, Cowling resistivity η_C, and its associated Joule heating. The color bar in panels 4 comprises two scales, where the top and bottom numbers correspond to 0.36 Mm and 0.72 Mm, respectively.