活动区附近声波参数的统计分析
Statistical analysis of acoustic wave parameters near active regions
摘要：
为了量化的影响，磁场上的声学模式参数和流动和周围的活动区域，我们分析的差异，在磁安静的区域附近的活动区域（我们称之为“附近的区域”）的参数，相比，安静的区域在相同的磁盘位置，没有相邻的活动区域。我们还比较了在活跃区的模式参数与那些在位于安静区。我们的分析是基于近五年来HMI观察到的所有活动区域的环形图分析。我们发现，在安静的附近区域的模式振幅从衰减到放大的变化的频率是4.2兆赫左右，在活跃的区域，它是约5.1兆赫。这种振幅增强（“声晕效应”）与在活动区观察到的一样大，对波传播方向的依赖性很弱。附近区域的模式能量差也在4.2 mHz左右从不足变为过剩，但在所有模式上平均为零。附近区域的频率差随着频率的增加而增加，直到频率偏移急剧翻转的点，如在活动区域中。然而，这种周转发生在4.9 mHz左右，明显低于声学截止频率。反转的水平流动参数的方向上的相邻的活动区域，我们发现的流动是一致的热能流被阻止直接低于活动区域的模型。
英文摘要：
In order to quantify the influence of magnetic fields on acoustic mode parameters and flows in and around active regions, we analyse the differences in the parameters in magnetically quiet regions nearby an active region (which we call `nearby regions'), compared with those of quiet regions at the same disc locations for which there are no neighboring active regions. We also compare the mode parameters in active regions with those in comparably located quiet regions. Our analysis is based on ring diagram analysis of all active regions observed by HMI during almost five years. We find that the frequency at which the mode amplitude changes from attenuation to amplification in the quiet nearby regions is around 4.2 mHz, in contrast to the active regions, for which it is about 5.1 mHz. This amplitude enhancement (the `acoustic halo effect') is as large as that observed in the active regions, and has a very weak dependence on the wave propagation direction. The mode energy difference in nearby regions also changes from a deficit to an excess at around 4.2 mHz, but averages to zero over all modes. The frequency difference in nearby regions increases with increasing frequency until a point at which the frequency shifts turn over sharply as in active regions. However, this turnover occurs around 4.9 mHz, significantly below the acoustic cutoff frequency. Inverting the horizontal flow parameters in the direction of the neighboring active regions, we find flows that are consistent with a model of the thermal energy flow being blocked directly below the active region.
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