TRANSVERSE OSCILLATIONS IN CHROMOSPHERIC MOTTLES
TRANSVERSE OSCILLATIONS IN CHROMOSPHERIC MOTTLES
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DOI：
10.1088/0004-637x/750/1/51
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
D. Kuridze;D. Kuridze;Richard Morton;R. Erdélyi;Gareth Dorrian;M. Mathioudakis;D. Jess;F. Keenan
中科院分区：
文献类型：
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作者：
D. Kuridze;D. Kuridze;Richard Morton;R. Erdélyi;Gareth Dorrian;M. Mathioudakis;D. Jess;F. Keenan
最近的一些研究表明，横波在太阳色球层中是普遍存在的。其中绝大多数已被报道在肢体骨针和活动区原纤维。我们调查长寿，安静的太阳，磁盘功能，如色球斑驳（位于超颗粒细胞的边界的喷气式功能）和它们的横向运动。这些观测是由邓恩太阳望远镜的太阳大气层快速振荡仪器获得的。该数据集包括在Hα核心，Ca ii K和G波段的磁盘上安静的太阳区域的同时成像。利用时距技术研究了横向振荡的特性。我们在亮斑和暗斑中检测到40多个横向振荡，周期范围从70到280 s，最频繁的发生在165 s。速度幅值和横向位移表现出类似肢体骨针的特征。还观察到相邻的斑点同相振荡。个别斑驳的横向振荡的磁流体动力学扭结波解释。它们的估计周期和阻尼时间与相位混合和谐振模式转换是一致的。
A number of recent investigations have revealed that transverse waves are ubiquitous in the solar chromosphere. The vast majority of these have been reported in limb spicules and active region fibrils. We investigate long-lived, quiet-Sun, on-disk features such as chromospheric mottles (jet-like features located at the boundaries of supergranular cells) and their transverse motions. The observations were obtained with the Rapid Oscillations in the Solar Atmosphere instrument at the Dunn Solar Telescope. The data set is comprised of simultaneous imaging in the Hα core, Ca ii K, and G band of an on-disk quiet-Sun region. Time–distance techniques are used to study the characteristics of the transverse oscillations. We detect over 40 transverse oscillations in both bright and dark mottles, with periods ranging from 70 to 280 s, with the most frequent occurrence at ∼165 s. The velocity amplitudes and transverse displacements exhibit characteristics similar to limb spicules. Neighboring mottles oscillating in-phase are also observed. The transverse oscillations of individual mottles are interpreted in terms of magnetohydrodynamic kink waves. Their estimated periods and damping times are consistent with phase mixing and resonant mode conversion.