11429活性区周围声晕的声发射增强
Enhanced Acoustic Emission in Relation to the Acoustic Halo Surrounding Active Region 11429
摘要：
在高频$p$模式谱中使用声全息可以解析有源区周围的晕结构内的增强声发射的源分布。在这样做时，然后可以应用统计方法来确定与磁场的关系。这是本文研究的重点。负责检测到的太阳活动区周围的声源增强的机制尚未得到解释。此外，磁场和增强声发射之间的关系尚未得到全面的研究。我们已经使用矢量磁图从\Helioseismic和磁成像仪（HMI）上的太阳动力学天文台（SDO）的图像的磁场性质的光环。我们已经研究了一个活动区域的声学形态，有一个复杂的光环和“荣耀”，我们已经把一些声学特性与磁场配置联系起来。特别是，我们发现，声源显着增强的区域中的中间场强度与倾角没有什么不同的分布在安静的太阳。此外，我们已经确定了一个过渡区之间的活动区和晕，在其中的声源功率是由中间场强的倾斜场阻碍。最后，我们比较了声发射地图的结果，从全息计算，和常用的本地声学地图，发现这两种类型的地图具有类似的属性相对于磁场，但缺乏空间相关性时，检查最高功率的区域。
英文摘要：
The use of acoustic holography in the high-frequency $p$-mode spectrum can resolve the source distributions of enhanced acoustic emissions within halo structures surrounding active regions. In doing so, statistical methods can then be applied to ascertain relationships with the magnetic field. This is the focus of this study. The mechanism responsible for the detected enhancement of acoustic sources around solar active regions has not yet been explained. Furthermore the relationship between the magnetic field and enhanced acoustic emission has not yet been comprehensively examined. We have used vector magnetograms from the \Helioseismic and Magnetic Imager (HMI) on-board the Solar Dynamics Observatory (SDO) to image the magnetic-field properties in the halo. We have studied the acoustic morphology of an active region, with a complex halo and "glories," and we have linked some acoustic properties to the magnetic-field configuration. In particular, we find that acoustic sources are significantly enhanced in regions of intermediate field strength with inclinations no different from the distributions found in the quiet Sun. Additionally we have identified a transition region between the active region and the halo, in which the acoustic source power is hindered by inclined fields of intermediate field strength. Finally, we have compared the results of acoustic emission maps, calculated from holography, and the commonly used local acoustic maps, finding that the two types of maps have similar properties with respect to the magnetic field but lack spatial correlation when examining the highest-powered regions.
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