Felipe T, Crouch A D, Birch A C
NorthWest Research Associates, Colorado Research Associates, Boulder, CO 80301, USA.
Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany.
Astrophys J. 2014;788(No 2). doi: 10.1088/0004-637X/788/2/136. Epub 2014 Jun 2.
The helioseismic properties of the wave scattering generated by monolithic and spaghetti sunspots are analyzed by means of numerical simulations. In these computations, an incident - or -mode travels through the sunspot model, which produces absorption and phase shift of the waves. The scattering is studied by inspecting the wavefield, computing travel-time shifts, and performing Fourier-Hankel analysis. The comparison between the results obtained for both sunspot models reveals that the differences in the absorption coefficient can be detected above noise level. The spaghetti model produces a steep increase of the phase shift with the degree of the mode at short wavelengths, while mode mixing is more efficient for the monolithic model. These results provide a clue for what to look for in solar observations to discern the constitution of sunspots between the proposed monolithic and spaghetti models.
通过数值模拟分析了整体黑子和面条状黑子产生的波散射的日震特性。在这些计算中，一个入射的o模穿过黑子模型，该模型会产生波的吸收和相移。通过检查波场、计算传播时间偏移以及进行傅里叶-汉克尔分析来研究散射。对两种黑子模型所得结果的比较表明，吸收系数的差异在噪声水平之上可以被检测到。面条状模型在短波长下随着模式度数的增加相移急剧增加，而整体模型的模式混合更有效。这些结果为在太阳观测中寻找什么以辨别所提出的整体模型和面条状模型之间黑子的构成提供了线索。
