An Extreme-ultraviolet Wave Generating Upward Secondary Waves in a Streamer-like Solar Structure by Ruisheng Zheng et al.*7 Aug 2018, 09:30 UTC
Extreme-ultraviolet (EUV) waves are spectacular horizontally propagating disturbances in the low solar corona. If an EUV wave encounters an ambient coronal structure it may trigger another horizontal wave, which is always named a ‘secondary wave’ (SW). We present the first example of upward SWs in a streamer-like structure, a bright loop-like structure developing over an active region, after the passing of an EUV wave. The EUV wave was associated with a coronal mass ejection (CME) and a type II radio burst that represented the existence of a coronal shock. Intriguingly, upward SWs rose slowly in the streamer-like structure after the sweeping of the EUV wave. We suggest that part of the EUV wave was probably trapped in the closed magnetic fields of the streamer-like structure, and upward SWs possibly resulted from the release of slow-mode trapped waves. It is believed that the interplay of the strong compression of the coronal shock and the configuration of the streamer-like structure is crucial for the formation of upward SWs.
The EUV wave occurred in NOAA AR 12661 on 2017 June 1. In the composite images (Fig.1(a)-(b)) of Large Angle and Spectrometric Coronagraph (LASCO) C2 and Atmospheric Imaging Assembly (AIA) 193 Å, AR ...