Ring-Diagram Analysis of the Structure of Solar Active Regions
Ring-Diagram Analysis of the Structure of Solar Active Regions
复制标题
太阳活动区结构的环图分析
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
R. Bogart
中科院分区：
文献类型：
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作者：
S. Basu;H. M. Antia;R. Bogart
我们测量太阳活动区和安静区之间的结构差异，使用从环图分析确定的高度模式的频率。我们发现，与安静区相比，活跃区的声速和绝热指数Γ1都不同。在紧邻的次表层中，声速在活动区域中较低，但在约7 μ m的深度以下，情况正好相反。声速反演结果与Γ1的结果的比较表明，活动区和安静区之间的差异至少有一部分可能是由于活动区磁场引起的结构和热扰动。
We measure differences in structure between active and quiet regions of the Sun using the frequencies of high-degree modes determined from ring-diagram analyses. We find that both the speed of sound and the adiabatic index Γ1 differ in active regions as compared with quiet regions. In the immediate subsurface layers, the sound speed is lower in active regions, but below a depth of about 7 Mm the opposite is true. A comparison of sound-speed inversion results with those for Γ1 indicates that at least a part of the differences between active and quiet regions is likely to be due to the structural and thermal perturbations caused by magnetic fields in the active region.