新兴活动区NOAA 10790的时距分析
Time-Distance analysis of the Emerging Active Region NOAA 10790
摘要：
本文用日震学的时间-距离方法研究了NOAA 10790活动区的出现.在磁活动增加的地方观察到声速增加的浅区域，在太阳黑子孔的位置观察到更深的区域。我们还看到一个长期的区域，位于下方的磁通量出现的区域，可能与温度扰动由于磁淬火的涡流扩散，或一个密集的磁通量管的声速降低。我们检测和跟踪的对象在太阳的次表层，其特征在于增加的声速，这可能与新兴的磁通量，从而获得一个临时估计的速度出现在$1 {\rm km s^{-1}}$左右。
英文摘要：
We investigate the emergence of Active Region NOAA 10790 by means of time--distance helioseismology. Shallow regions of increased sound speed at the location of increased magnetic activity are observed, with regions becoming deeper at the locations of sunspot pores. We also see a long-lasting region of decreased sound speed located underneath the region of the flux emergence, possibly relating to a temperature perturbation due to magnetic quenching of eddy diffusivity, or to a dense flux tube. We detect and track an object in the subsurface layers of the Sun characterised by increased sound speed which could be related to emerging magnetic flux and thus obtain a provisional estimate of the speed of emergence of around $1 {\rm km s^{-1}}$.
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