An extreme ultraviolet wave associated with the possible expansion of sheared arcades. (arXiv:2304.14862v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Liu_Y/0/1/0/all/0/1">Yihan Liu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zheng_R/0/1/0/all/0/1">Ruisheng Zheng</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_L/0/1/0/all/0/1">Liang Zhang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wei_H/0/1/0/all/0/1">Hengyuan Wei</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhong_Z/0/1/0/all/0/1">Ze Zhong</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yang_S/0/1/0/all/0/1">Shuhong Yang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chen_Y/0/1/0/all/0/1">Yao Chen</a>
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.
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.
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