Context maps showing the photospheric and coronal diagnostics of plage areas in active regions. Panel a: photospheric line-of-sight magnetic field map of an evolved active region obtained from SDO/HMI. The white and black shaded areas are the positive- and negative-polarity magnetic field regions, saturated at ±300 G. The white box covers a patch of the active region with a predominantly negative-polarity magnetic field in an area of 16.5″ × 16.5″. Panel b: map of coronal emission of the active region recorded by the SDO/AIA 193 Å filter. The black box, which is cospatial with the white box in panel (a), identifies a coronal low-lying moss emission in this active region. Panels c and d: are the same as panels (a) and (b), but plotted for a decaying active region (weaker than the above). The black boxes have the same size as in the top panels and cover a predominantly positive-polarity magnetic field patch in this active region. Bottom panels: black box is the target region of the SST co-observations. The smaller blue box corresponds to region 3 in Fig. 1. See Sect. 2 for details.