Fig. 1From: The transition region above sunspotsImages of the photosphere (upper left, IRIS SJI 2832 Å), chromosphere (upper right, IRIS SJI 2796 Å), TR (lower left, IRIS SJI 1400 Å) and lower corona (lower right, SDO/AIA 171 Å) in a sunspot region. These images were taken on July 20, 2013. The field of view of each image has a size of 50″ × 42″Back to article page