Observations of a peculiar coronal wave inside a pseudo-streamer structure

Coronal extreme ultraviolet (EUV) waves are large-scale disturbances propagating in the corona and are closely associated with solar eruptions. They can disturb the ambient plasma over a wide temperature range, resulting in simultaneous observations in multiple EUV passbands, and the wavefronts are typically best observed in AIA 193 and 211 angstrom channels with temperatures ranging from 1.6 to 2 MK. Here, we report a peculiar EUV wave that was invisible in the 193 and 211 angstrom but appeared instead in AIA 171 angstrom, corresponding to a lower temperature. Driven by a coronal jet, the wave propagated at a speed of similar to 560 km s(-1). The differential emission measure (DEM) analysis shows that the emission of the wavefront concentrated at similar to 1.25 MK, lower than the typical predominant temperatures. In addition, the fields extrapolated using the potential field source surface (PFSS) method indicate the existence of a typical pseudo-streamer structure. Hence, we propose that it is possibly the first case of an EUV wave occurring and propagating inside a pseudo-streamer, and its visibility is likely determined by the relatively cooler plasma within the pseudo-streamer.