Observations of the magnetic transients in a plage region. Details of the photospheric magnetic field in a decaying active region outlined by the black box in Fig. A.1c are shown. Panel a: line-of-sight magnetic field map obtained from SST observations on 26 June 2015 07:45 UT. The three boxes (numbered 1–3; each covering an area of 5.76″ × 5.76″) enclose regions exhibiting transient magnetic flux emergence and cancellation at different instances during the evolution of a predominantly positive-polarity magnetic field patch in that active region (box 3 highlights one such transient). Panel b: line-of-sight magnetic field map obtained from the SDO/HMI displayed for comparison. Both maps are saturated at ±100 G. See Sect. 2 for details.