太阳远侧活动区的时距成像
Time-Distance Imaging of Solar Far-Side Active Regions
摘要：
对太阳远侧大面积活动区的监测对于空间天气预报具有重要意义，特别是在活动区从太阳东翼旋转进入我们的视野之前预报它们的出现。局部日震学技术，包括日震全息术和时间-距离，已经成功地对太阳远侧活动区成像。在这封信中，我们进一步探讨了利用时距日震学对太阳远侧活动区进行成像和提高图像质量的可能性。除了以前使用的方案与四个声学信号跳跃，五个跳跃方案也包括在这个新开发的技术。四跳远侧图像和五跳远侧图像的组合显著地增强了远侧图像中的信噪比，并且减少了伪信号。利用一年的太阳观测数据对远侧活动区成像的精度进行了评估。
英文摘要：
It is of great importance to monitor large solar active regions in the far-side of the Sun for space weather forecast, in particular, to predict their appearance before they rotate into our view from the solar east limb. Local helioseismology techniques, including helioseismic holography and time-distance, have successfully imaged solar far-side active regions. In this Letter, we further explore the possibility of imaging and improving the image quality of solar far-side active regions by use of time-distance helioseismology. In addition to the previously used scheme with four acoustic signal skips, a five-skip scheme is also included in this newly developed technique. The combination of both four- and five-skip far-side images significantly enhances the signal-to-noise ratio in the far-side images, and reduces spurious signals. The accuracy of the far-side active region imaging is also assessed using one whole year solar observation.
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