The absorption of p-modes by sunspots - Variations with degree and order
The absorption of p-modes by sunspots - Variations with degree and order
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太阳黑子对 p 模式的吸收 - 随程度和顺序的变化
DOI：
10.1086/172483
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
J. H. Thomas
中科院分区：
文献类型：
--
作者：
T. Bogdan;T. Brown;B. Lites;J. H. Thomas
将p模分解为向内和向外传播的波，研究了孤立的太阳黑子对p模的吸收。在0-0.8/Mm范围内，随着水平波数k的增加，吸收系数（随频率和方位顺序的平均值）增加。对于较大的水平波数，在0.8 ~ 1.5/Mm范围内，吸收系数随k的增加而减小。在200 ~ 400范围内，每个p模脊的吸收趋于在球谐度的中间值处达到峰值。沿p(1)脊吸收最高，随径向阶数增加而减小。
A spherical harmonic decomposition of the p-modes into inward and outward propagating waves is employed to investigate the absorption of solar p-modes by an isolated sunspot. The absorption coefficient (averaged over frequency and azimuthal order) is found to increase with increasing horizontal wavenumber k over the range 0-0.8/Mm. For larger horizontal wavenumbers, in the range 0.8-1.5/Mm, the absorption coefficient decreases with increasing k. The absorption along each individual p-mode ridge tends to peak at an intermediate value of the spherical harmonic degree in the range 200-400. The highest absorption is found along the p(1) ridge, and the absorption decreases with increasing radial order.