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首页> 外文会议>SOHO 13 - waves, oscillations and small-scale transients events in the solar atmosphere: a joint view from SOHO and TRACE >ON THE EFFECT OF NON-UNIFORM SUBSURFACE FLOWS ON HIGH DEGREE P-MODES
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ON THE EFFECT OF NON-UNIFORM SUBSURFACE FLOWS ON HIGH DEGREE P-MODES

机译：非均匀子表面流对高次P模式的影响

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摘要

The observed power spectrum of high-degree solar p- modes ( l> 200) shows discrepancies with the power spectrum predicted by the stochastic excitation and damping theory. In an attempt to explain these discrepancies, the present paper is concerned with the influence of the observed subsurface flows on the trapped acoustic modes (p-modes). The effect of these inhomogeneous background flows is investigated by means of a nonmodal analysis and a multi-layer model. It is shown that the rotational and meridional components of the velocity field change the wavelengths of the oscillation modes which, in turn, results in modifications of the corresponding modal frequencies. The magnitudes of the frequency residuals depend on the spatial scales of the modes and on the gradients of the different components of the flow velocity. Together with other mechanisms (e.g. the scattering of modes by the convective motions), the nonmodal effect of the variation of the frequencies in time contributes: 1) to the observed widening of the corresponding peaks in the observed power spectrum with increasing angular degree; 2) to the partial dissipation of spectral power, and, as a result, 3) to the discrepancies between the predicted and the observed power spectrum of solar p-modes.
机译：观测到的高阶太阳p-模（l> 200）的功率谱显示出与随机激励和阻尼理论预测的功率谱的差异。为了解释这些差异，本文关注观察到的地下流动对陷获的声模（p型）的影响。通过非模态分析和多层模型研究了这些不均匀背景流的影响。结果表明，速度场的旋转分量和子午线分量会改变振荡模式的波长，进而导致相应模态频率的改变。频率残差的大小取决于模式的空间比例以及流速不同分量的梯度。与其他机制（例如对流运动引起的模态散射）一起，频率随时间变化的非模态效应有助于：1）随着角度的增加，观察到的观察到的功率谱中相应峰的变宽; 2）频谱功率的部分耗散，结果3）太阳p模式的预测功率谱与实测功率谱之间的差异。

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