Solar scintillation detection and ranging (SCIDAR) technique for measuring turbulent-layer heights
Solar scintillation detection and ranging (SCIDAR) technique for measuring turbulent-layer heights
复制标题
DOI：
10.1093/mnras/stt1074
复制
发表时间：
2013-09
影响因子：
4.8
通讯作者：
N. Miura;A. Oh-ishi;Shingo Shionoya;Koji Watanabe;S. Kuwamura;N. Baba;S. Ueno;K. Ichimoto
中科院分区：
文献类型：
--
作者：
N. Miura;A. Oh-ishi;Shingo Shionoya;Koji Watanabe;S. Kuwamura;N. Baba;S. Ueno;K. Ichimoto
提出了一种太阳 SCIDAR（闪烁探测和测距）技术，用于使用太阳本身测量湍流层的高度，而不是夜间 SCIDAR 中使用的双星。该技术的公式是在各种假设下得出的：太阳表面上的均匀强度分布和图像平面上的稀疏散斑分布。它表明闪烁阴影的互相关在对应于层高的位置处产生峰值，尽管峰值的形状因扩展视镜盘和有限尺寸的视场光阑而变得模糊。还描述了观测系统中由视场光阑引起的刀口效应，该效应在相关平面的中心产生另一个峰值。使用日本飞驒天文台开发的太阳 SCIDAR 系统进行观测。在许多结果中，相关平面上的峰值表现出足够高的对比度，足以将它们与背景区分开来。大部分由闪烁峰得出的湍流层距离被发现在 2.5 至 3.5 公里之间。建议在 SCIDAR 系统上游使用高性能自适应光学系统，以提供更好的结果。
A solar SCIDAR (scintillation detection and ranging) technique is proposed for measuring the heights of turbulent layers using the Sun itself, instead of the binary stars used in night-time SCIDAR. A formula for the technique is derived under various assumptions: uniform intensity distributions on the solar surface and sparse speckle distributions on the image plane. It indicates that the cross-correlation of scintillation shadows yields peaks at positions corresponding to layer heights, although the shapes of peaks are blurred by both an extended seeing disc and a finite-sized field stop. A knife-edge effect caused by field stops in an observational system is also described, which yields another peak at the centre of the correlation plane. Observations were conducted using a solar SCIDAR system developed at the Hida Observatory in Japan. In many results, peaks on correlation planes demonstrated a contrast high enough for them to be distinguished from the background. Most of the distances to turbulent layers derived from the scintillation peaks were found to be between 2.5 and 3.5 km. Use of a high-performance adaptive-optics system upstream of the SCIDAR system is suggested in order to provide better results.