SOLAR MAGNETIC TRACKING. III. APPARENT UNIPOLAR FLUX EMERGENCE IN HIGH-RESOLUTION OBSERVATIONS
SOLAR MAGNETIC TRACKING. III. APPARENT UNIPOLAR FLUX EMERGENCE IN HIGH-RESOLUTION OBSERVATIONS
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DOI：
10.1088/0004-637x/720/2/1405
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发表时间：
2010-09
期刊：
影响因子：
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通讯作者：
D. Lamb;C. Deforest;H. Hagenaar;C. Parnell;B. Welsch
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作者：
D. Lamb;C. Deforest;H. Hagenaar;C. Parnell;B. Welsch
了解电流仪器探测极限附近的弱磁场行为对于在小空间尺度上确定太阳光球层的通量平衡是很重要的。利用Hinode航天器上太阳光学望远镜窄带滤光片成像器(NFI)的0.“3分辨率磁图，我们确认了以前报道的中分辨率磁图中出现的明显单极磁通确实是先前存在的磁通的结合。我们证明，在NFI磁图中看到的类似但较小的事件也可能对应于先前存在的弱场的合并。只有在数百个这样的事件的集合平均中才能检测到的未结合的通量占检测到的特征3 mm内的总通量的50%。在合并过程中可以直接观察到明显的单极涌现的空间尺度仍不清楚。考虑到数据集的不平衡，聚结通量的极性比预期的更平衡，然而，如果没有进一步的研究，我们无法推测这是否意味着表观单极浮现事件中的通量是由颗粒规模的发电机产生的，还是从现有领域回收的。
Understanding the behavior of weak magnetic fields near the detection limit of current instrumentation is important for determining the flux budget of the solar photosphere at small spatial scales. Using 0.″3-resolution magnetograms from the Solar Optical Telescope's Narrowband Filter Imager (NFI) on the Hinode spacecraft, we confirm that the previously reported apparent unipolar magnetic flux emergence seen in intermediate-resolution magnetograms is indeed the coalescence of previously existing flux. We demonstrate that similar but smaller events seen in NFI magnetograms are also likely to correspond to the coalescence of previously existing weak fields. The uncoalesced flux, detectable only in the ensemble average of hundreds of these events, accounts for 50% of the total flux within 3 Mm of the detected features. The spatial scale at which apparent unipolar emergence can be directly observed as coalescence remains unknown. The polarity of the coalescing flux is more balanced than would be expected given the imbalance of the data set, however without further study we cannot speculate whether this implies that the flux in the apparent unipolar emergence events is produced by a granulation-scale dynamo or is recycled from existing field.