Possible Signature of Sausage Waves in Photospheric Bright Points
Possible Signature of Sausage Waves in Photospheric Bright Points
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DOI：
10.1007/s11207-021-01928-9
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发表时间：
2021-12
期刊：
影响因子：
2.8
通讯作者：
Yuhang Gao;Fuyu Li;Bo Li;W. Cao;Yongliang Song;H. Tian;M. Guo
中科院分区：
文献类型：
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作者：
Yuhang Gao;Fuyu Li;Bo Li;W. Cao;Yongliang Song;H. Tian;M. Guo
香肠波在太阳黑子、气孔和日冕环等太阳磁性结构中经常被报道。然而，它们并没有在光球亮点(BPS)中被明确识别。利用大熊太阳天文台的Goode太阳望远镜获得的高分辨率的TiO图像序列，我们分析了四个孤立的BP。结果发现，它们的面积和平均强度以同相方式振荡了几个周期。振荡周期从100秒到200秒不等。在讨论了香肠波理论和不透明度效应之后，我们将这种位相关系解释为香肠波，特别是慢波的特征。
Sausage waves have been frequently reported in solar magnetic structures such as sunspots, pores, and coronal loops. However, they have not been unambiguously identified in photospheric bright points (BPs). Using high-resolution TiO image sequences obtained with theGoode Solar Telescopeat the Big Bear Solar Observatory, we analyzed four isolated BPs. It was found that their area and average intensity oscillate for several cycles in an in-phase fashion. The oscillation periods range from 100 to 200 seconds. We interpreted the phase relation as a signature of sausage waves, particularly slow waves, after discussing sausage-wave theory and the opacity effect.