An extreme ultraviolet wave associated with the possible expansion of sheared arcades

Abstract

Context. Solar extreme ultraviolet (EUV) waves are propagating disturbances in the corona, and they usually accompany with various solar eruptions, from large-scale coronal mass ejections to small-scale coronal jets. Aims. Generally, it is believed that EUV waves are driven by the rapid expansion of coronal loops overlying the erupting cores. In this Letter, we present an exception of EUV wave that was not triggered by the expansion of coronal loops overlying the erupting core. Methods. Combining the multiwavelength observations from multiple instruments, we studied the event in detail. Results. The eruption was restricted in the active region (AR) and disturbed the nearby sheared arcades (SAs) connecting the source AR to a remote AR. Interestingly, following the disturbance, an EUV wave formed close to the SAs, but far away from the eruption source. Conclusions. All the results showed that the EUV wave had a closer temporal and spatial relationship with the disappearing part of SAs than the confined eruption. Hence, we suggest that the EUV wave was likely triggered by the expansion of some strands of SAs, rather than the expansion of erupting loops. It can be a possible complement for the driving mechanisms of EUV waves.

arXiv comment9 pages, 6 figures

References in corpus (15)

• Astropy: A Community Python Package for Astronomy
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Structure, Stability, and Evolution of Magnetic Flux Ropes from the Perspective of Magnetic Twist
• Multi-scale Gaussian normalization for solar image processing
• Advances in Observing Various Coronal EUV Waves in the SDO Era and Their Seismological Applications (Invited Review)
• Solar Force-free Magnetic Fields
• Large-scale Coronal Propagating Fronts in Solar Eruptions as Observed by the Atmospheric Imaging Assembly on Board the Solar Dynamics Observatory\,--\,An Ensemble Study
• On a small-scale EUV wave: the driving mechanism and the associated oscillating filament
• First Unambiguous Imaging of Large-Scale Quasi-Periodic Extreme-Ultraviolet Wave or Shock
• EUV Waves Driven by the Sudden Expansion of Transequatorial Loops Caused by Coronal Jets
• A Compressed Sensing-based Image Reconstruction Algorithm for Solar Flare X-Ray Observations
• Dynamic Processes of the Moreton Wave on 2014 March 29
• The initial morphologies of the wavefronts of extreme ultraviolet waves
• An Extreme Ultraviolet Wave Associated with A Solar Filament Activation
• Birth places of extreme ultraviolet waves driven by impingement of solar jets upon coronal loops