太阳色球层动力学。V.来自TRACE的紫外图像序列中的高频调制
Dynamics of the solar chromosphere. V. High-frequency modulation in ultraviolet image sequences from TRACE
摘要：
我们寻找的高频振荡的签名，在太阳上层光球和低色球的背景下，声加热的外恒星大气。我们使用的紫外图像序列的一个安静的中心盘区域的过渡区和日冕探测器（TRACE）的任务，采取了严格的节奏规律。后者允许更可靠的高频诊断比在早期的工作。空间傅立叶功率图、空间平均相干性和相位差谱以及时空k-f分解都包含高频特征，这些高频特征乍一看似乎具有相当大的内在兴趣，但实际上更可能代表不同性质的伪影。空间平均相位差测量提供了最灵敏的诊断，并指示互联网络区域中存在高达f=20 mHz（周期低至50秒）的声学调制。
英文摘要：
We search for signatures of high-frequency oscillations in the upper solar photosphere and low chromosphere in the context of acoustic heating of outer stellar atmospheres. We use ultraviolet image sequences of a quiet center-disk area from the Transition Region and Coronal Explorer (TRACE) mission which were taken with strict cadence regularity. The latter permits more reliable high-frequency diagnosis than in earlier work. Spatial Fourier power maps, spatially averaged coherence and phase-difference spectra, and spatio-temporal k-f decompositions all contain high-frequency features that at first sight seem of considerable intrinsic interest but actually are more likely to represent artifacts of different nature. Spatially averaged phase difference measurement provides the most sensitive diagnostic and indicates the presence of acoustic modulation up to f=20 mHz (periods down to 50 seconds) in internetwork areas.
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