TIME DISTANCE HELIOSEISMOLOGY
TIME DISTANCE HELIOSEISMOLOGY
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DOI：
10.1038/362430a0
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发表时间：
1993-04-01
期刊：
影响因子：
64.8
通讯作者：
POMERANTZ, MA
中科院分区：
文献类型：
--
作者：
DUVALL, TL;JEFFERIES, SM;POMERANTZ, MA
地震学在太阳内部研究中的应用（日震学）几乎完全是通过预测和测量太阳的自由振荡或正常模式的频率而取得进展的。考虑到太阳震源的数量和随机性，直接测量单个声波的传播时间和距离——陆地地震学的主要方法——似乎更加困难。然而，在这里，我们表明有可能从太阳表面强度波动的时间互相关中提取时间-距离信息。这种方法为局部太阳现象（如太阳黑子附近的地下不均匀性）的地震研究开辟了道路，并有助于完善太阳内部速度分层的全球模型。
THE application of seismology to the study of the solar interior1,2 (helioseismology) has advanced almost solely by the prediction and measurement of the Sun's frequencies of free oscillation, or normal modes. Direct measurement of the travel times and distances of individual acoustic waves-the predominant approach in terrestrial seismology3-would appear to be more difficult in view of the number and stochastic nature of solar seismic sources. Here, however, we show that it is possible to extract time-distance information from temporal cross-correlations of the intensity fluctuations on the solar surface. This approach opens the way for seismic studies of local solar phenomena, such as subsurface inhomogeneities near sunspots, and should help to refine global models of the internal velocity stratification in the Sun.