Oscillations in network bright points (NBPs) are studied at a variety of chromospheric heights. In particular, the three-dimensional variation of NBP oscillations is studied using image segmentation and cross-correlation analysis between images taken in light of Ca II K3, Hα core, Mg I b2, and Mg I b1 - 0.4 ?. Wavelet analysis is used to isolate wave packets in time and to search for height-dependent time delays that result from upward- or downward-directed traveling waves. In each NBP studied, we find evidence for kink-mode waves (1.3, 1.9 mHz), traveling up through the chromosphere and coupling with sausage-mode waves (2.6, 3.8 mHz). This provides a means for depositing energy in the upper chromosphere. We also find evidence for other upward- and downward-propagating waves in the 1.3-4.6 mHz range. Some oscillations do not correspond to traveling waves, and we attribute these to waves generated in neighboring regions.
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机译：研究了在各种色球高度下网络亮点（NBP）的振荡。特别地，使用图像分割和在Ca II K3，Hα核，Mg I b2和Mg I b1-0.4α的图像之间的互相关分析研究了NBP振荡的三维变化。小波分析用于及时隔离波包，并搜索由向上或向下定向的行波导致的高度相关的时间延迟。在每个研究的NBP中，我们发现扭结模波（1.3，1.9 mHz），通过色球向上传播并与香肠模波（2.6、3.8 mHz）耦合的证据。这提供了一种在上层色球中沉积能量的手段。我们还发现了在1.3-4.6 mHz范围内其他向上和向下传播的波的证据。一些振荡不对应于行波，我们将其归因于在相邻区域中产生的波。
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