Detection of Propagating Fast Sausage Waves through Detailed Analysis of a Zebra-pattern Fine Structure in a Solar Radio Burst
Detection of Propagating Fast Sausage Waves through Detailed Analysis of a Zebra-pattern Fine Structure in a Solar Radio Burst
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DOI：
10.3847/2041-8213/aab2a5
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
K. Kaneda;H. Misawa;K. Iwai;S. Masuda;F. Tsuchiya;Y. Katoh;T. Obara
中科院分区：
文献类型：
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作者：
K. Kaneda;H. Misawa;K. Iwai;S. Masuda;F. Tsuchiya;Y. Katoh;T. Obara
最近在日冕中探测到了各种磁流体(MHD)波，并在日冕加热和日冕地震学的背景下进行了深入的研究。在这封信中，我们报道了首次在米波频段精细结构中探测到短周期传播的快速香肠模波，该精细结构是由米波波段口径望远镜和实时分析系统组合而成。对IV型爆发斑马纹(ZP)的分析表明，ZP相邻条纹之间的频率间隔(Δf)是准周期调制。观测到的准周期调制具有1-2个S周期，并表现出3-8 MHz的负频率漂移特征，S−1。在双等离子体共振模型的基础上，观测到的ZP准周期调制可以用相速度为3,000-8,000公里的快香肠模波向上传播来解释。这些结果为探索冕环的精细结构提供了新的见解。
Various magnetohydrodynamic (MHD) waves have recently been detected in the solar corona and investigated intensively in the context of coronal heating and coronal seismology. In this Letter, we report the first detection of short-period propagating fast sausage mode waves in a metric radio spectral fine structure observed with the Assembly of Metric-band Aperture Telescope and Real-time Analysis System. Analysis of Zebra patterns (ZPs) in a type-IV burst revealed a quasi-periodic modulation in the frequency separation between the adjacent stripes of the ZPs (Δf ). The observed quasi-periodic modulation had a period of 1–2 s and exhibited a characteristic negative frequency drift with a rate of 3–8 MHz s−1. Based on the double plasma resonance model, the most accepted generation model of ZPs, the observed quasi-periodic modulation of the ZP can be interpreted in terms of fast sausage mode waves propagating upward at phase speeds of 3000–8000 km s−1. These results provide us with new insights for probing the fine structure of coronal loops.