横向振荡冕环的解析近似地震学
Analytic approximate seismology of transversely oscillating coronal loops
摘要：
本文提出了一种基于细管薄边界近似的阻尼横向冕环振荡的近似地震反演方法，用于计算周期和阻尼时间。周期和阻尼率的渐近表达式被用来说明地震学反演的过程中，在一个简单和易于遵循的方式。反演过程是制定在两个简单的功能，这是由简单的封闭表达式。解析地震反演表明，无穷多个一维平衡模型都可以再现观测到的周期和阻尼时间。它预测了一个特定范围的允许值的阿尔芬旅行时间和下限的密度对比度和不均匀性长度尺度。当本分析地震反演的结果与以前的数值反演的结果进行比较时，发现到分析地震反演作为用于验证数值反演结果的工具出现的点的极好的一致性。实际上，它帮助我们识别和纠正以前数值研究中的不准确之处。
英文摘要：
We present an analytic approximate seismic inversion scheme for damped transverse coronal loop oscillations based on the thin tube and thin boundary approximation for computing the period and the damping time. Asymptotic expressions for the period and damping rate are used to illustrate the process of seismological inversion in a simple and easy to follow manner. The inversion procedure is formulated in terms of two simple functions, which are given by simple closed expressions. The analytic seismic inversion shows that an infinite amount of 1-dimensional equilibrium models can reproduce the observed periods and damping times. It predicts a specific range of allowable values for the Alfven travel time and lower bounds for the density contrast and the inhomogeneity length scale. When the results of the present analytic seismic inversion are compared with those of a previous numerical inversion, excellent agreement is found up to the point that the analytic seismic inversion emerges as a tool for validating results of numerical inversions. Actually it helped us to identify and correct inaccuracies in a previous numerical investigation.
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