Multi-instrumental imaging of sunspot AR11131 (08 Dec. 2010) at different heights. a) The line-of-sight magnetic field strength obtained with Helioseismic and Magnetic Imager onboard SDO overlaid with the polar coordinate system used in this study. b)−d) EUV intensity images at different wavelengths obtained with SDO/AIA showing different levels of the sunspot atmosphere. In order of increasing height: temperature minimum level (1700 Å), upper photosphere and transition region (1600 Å), and chromosphere (304 Å). The dotted lines show the sunspot’s umbra-penumbra boundary determined with AIA 4500 Å image.