MEASUREMENTS OF THE ABSORPTION AND SCATTERING CROSS SECTIONS FOR THE INTERACTION OF SOLAR ACOUSTIC WAVES WITH SUNSPOTS
MEASUREMENTS OF THE ABSORPTION AND SCATTERING CROSS SECTIONS FOR THE INTERACTION OF SOLAR ACOUSTIC WAVES WITH SUNSPOTS
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太阳声波与太阳黑子相互作用的吸收和散射截面的测量
DOI：
10.3847/0004-637x/822/1/23
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
D. Chou
中科院分区：
文献类型：
--
作者：
Hui Zhao;D. Chou
太阳声波因与太阳黑子的相互作用而发生变化。这种相互作用可以看作是散射问题：入射波向太阳黑子传播，被太阳黑子散射成不同的模式。吸收截面和散射截面是散射问题中的两个重要参数。在这项研究中，我们使用的散射波的波函数，测量与反卷积方法，计算的吸收截面σab和散射截面σsc的径向阶数n = 0-5的两个太阳黑子，NOAA 11084和NOAA 11092。在截面的计算中，对测量声功率中的随机噪声和耗散进行了校正。对于σab和σsc，NOAA 11092的值大于NOAA 11084的值，但它们的总体n依赖性是相似的：随着n而减小。NOAA 11092和NOAA 11084的σab之比在所有n下都近似等于黑子半径之比，而两个黑子的σsc之比大于黑子半径之比，并随n的增加而增加。这表明，σab近似正比于太阳黑子半径，而σsc对半径的依赖性比线性增加更快。
The solar acoustic waves are modified by the interaction with sunspots. The interaction can be treated as a scattering problem: an incident wave propagating toward a sunspot is scattered by the sunspot into different modes. The absorption cross section and scattering cross section are two important parameters in the scattering problem. In this study, we use the wavefunction of the scattered wave, measured with a deconvolution method, to compute the absorption cross section σab and the scattering cross section σsc for the radial order n = 0–5 for two sunspots, NOAA 11084 and NOAA 11092. In the computation of the cross sections, the random noise and dissipation in the measured acoustic power are corrected. For both σab and σsc, the value of NOAA 11092 is greater than that of NOAA 11084, but their overall n dependence is similar: decreasing with n. The ratio of σab of NOAA 11092 to that of NOAA 11084 approximately equals the ratio of sunspot radii for all n, while the ratio of σsc of the two sunspots is greater than the ratio of sunspot radii and increases with n. This suggests that σab is approximately proportional to the sunspot radius, while the dependence of σsc on radius is faster than the linear increase.
太阳黑子的日震学：波前的散焦、折叠和修复
影响因子：
6.5
作者：
Schunker;Philippe
通讯作者：
Philippe