Basic Principles of Solar Acoustic Holography – (Invited Review)
Basic Principles of Solar Acoustic Holography – (Invited Review)
复制标题
太阳声全息术的基本原理 - （特邀评审）
DOI：
10.1023/a:1005227200911
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发表时间：
2000
期刊：
影响因子：
2.8
通讯作者：
D. Braun
中科院分区：
文献类型：
--
作者：
C. Lindsey;D. Braun
我们总结了太阳内部的全息地震成像的基本原理，借鉴熟悉的光学原理和与标准光学全息术的相似之处。计算地震全息术是根据太阳表面日震观测资料，通过相位相干波力学方法重建太阳内部的p模声场而实现的。它以与眼睛如何处理角膜表面处的电磁辐射大致类似的方式处理太阳表面处的声场，波机械地重新聚焦来自浸没源的辐射，以呈现可以在任何所需深度的焦面上采样的像散图像。全息诊断提供了一个直接的评估所观察到的p-模式光谱的信息内容独立于它所代表的局部内部异常的前瞻性物理模型。计算全息被提出作为最佳方法，从而解决严重的衍射效应，面对标准的层析成像在太阳p模式的环境。在过去的两年里，它给了我们许多非凡的发现，现在有望从局部角度对太阳内部结构和动力学有新的认识。我们比较了简单的声功率全息和相敏全息的诊断作用，并预计太阳内部建模的全息签名的基础上的方法。我们确定了简单的计算原理，适用于高质量的日震观测，使未来的分析师很容易产生高质量的全息图像，在当地的日震学的实际应用。
We summarize the basic principles of holographic seismic imaging of the solar interior, drawing on familiar principles in optics and parallels with standard optical holography. Computational seismic holography is accomplished by the phase-coherent wave-mechanical reconstruction of the p-mode acoustic field into the solar interior based on helioseismic observations at the solar surface. It treats the acoustic field at the solar surface in a way broadly analogous to how the eye treats electromagnetic radiation at the surface of the cornea, wave-mechanically refocusing radiation from submerged sources to render stigmatic images that can be sampled over focal surfaces at any desired depth. Holographic diagnostics offer a straight-forward assessment of the informational content of the observed p-mode spectrum independent of prospective physical models of the local interior anomalies that it represents. Computational holography was proposed as the optimum approach whereby to address the severe diffraction effects that confront standard tomography in the solar p-mode environment. It has given us a number of remarkable discoveries in the last two years and now promises a new insight into solar interior structure and dynamics in the local perspective. We compare the diagnostic roles of simple acoustic-power holography and phase-sensitive holography, and anticipate approaches to solar interior modeling based on holographic signatures. We identify simple computational principles that, applied to high-quality helioseismic observations, make it easy for prospective analysts to produce high-quality holographic images for practical applications in local helioseismology.