衰减活动区中的磁通量损失和通量输运
Magnetic Flux Loss and Flux Transport in a Decaying Active Region
摘要：
利用光球层矢量磁场空间分布的时间序列，估算了衰减活动区垂直于太阳表面的磁通量的时间变化。矢量磁场是从日野号上的太阳光学望远镜的全偏振光谱测量得出的。我们比较了一个磁通量损失率的通量运输率在一个衰变的太阳黑子及其周围的护城河地区。在太阳黑子和护城河区域减少的磁通量的量与传输到护城河区域外边界的磁通量非常相似。具有正极性和负极性的磁性元件的通量损失率[ $(dF/dt)_{loss}$ ]在护城河区域的外边界周围彼此平衡。这些结果表明，大部分的磁通量在太阳黑子被传输到护城河区的外边界作为移动的磁功能，然后从光球周围的护城河区的外边界附近的磁通抵消。
英文摘要：
We estimate the temporal change of magnetic flux perpendicular to the solar surface in a decaying active region by using a time series of the spatial distribution of vector magnetic fields in the photosphere. The vector magnetic fields are derived from full spectropolarimetric measurements with the Solar Optical Telescope aboard Hinode. We compare a magnetic flux loss rate to a flux transport rate in a decaying sunspot and its surrounding moat region. The amount of magnetic flux that decreases in the sunspot and moat region is very similar to magnetic flux transported to the outer boundary of the moat region. The flux loss rates [$(dF/dt)_{loss}$] of magnetic elements with positive and negative polarities are balanced each other around the outer boundary of the moat region. These results suggest that most of the magnetic flux in the sunspot is transported to the outer boundary of the moat region as moving magnetic features, and then removed from the photosphere by flux cancellation around the outer boundary of the moat region.
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