IS THE POLAR REGION DIFFERENT FROM THE QUIET REGION OF THE SUN?
IS THE POLAR REGION DIFFERENT FROM THE QUIET REGION OF THE SUN?
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DOI：
10.1088/0004-637x/719/1/131
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发表时间：
2008-12
期刊：
影响因子：
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通讯作者：
Hiroaki Ito;S. Tsuneta;D. Shiota;M. Tokumaru;K. Fujiki
中科院分区：
文献类型：
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作者：
Hiroaki Ito;S. Tsuneta;D. Shiota;M. Tokumaru;K. Fujiki
对太阳极地区域的观测对于了解太阳发电机和太阳风的加速至关重要。我们用日之出号上太阳光学望远镜的分光偏振计对北极地区和东翼的宁静太阳进行了精确的磁观测，以确定极地地区相对于宁静太阳的特征。极区千高斯磁集中的平均面积和总磁通量似乎比宁静太阳的大。在平静的太阳中，被归类为垂直的磁场矢量在强度为零的附近具有对称的直方图，显示出平衡的正和负通量，而北极地区的直方图明显不对称，显示出负极性的优势。极区的总磁通量大于宁静太阳的总磁通量。相比之下，水平磁场的直方图在极地和平静的太阳中完全相同。这与水平磁场是由局部发电机过程引起的观点是一致的。一个高分辨率的位场外推表明，在极地地区的大部分磁场线从千克补丁是开放的扇出结构非常低的大气中，而在安静的太阳，几乎所有的磁力线是关闭的。
Observations of the polar region of the Sun are critically important for understanding the solar dynamo and the acceleration of solar wind. We carried out precise magnetic observations on both the north polar region and the quiet Sun at the east limb with the spectropolarimeter of the Solar Optical Telescope aboard Hinode to characterize the polar region with respect to the quiet Sun. The average area and the total magnetic flux of the kilo-Gauss magnetic concentrations in the polar region appear to be larger than those of the quiet Sun. The magnetic field vectors classified as vertical in the quiet Sun have symmetric histograms around zero in the strengths, showing balanced positive and negative fluxes, while the histogram in the north polar region is clearly asymmetric, showing a predominance of the negative polarity. The total magnetic flux of the polar region is larger than that of the quiet Sun. In contrast, the histogram of the horizontal magnetic fields is exactly the same for both the polar region and the quiet Sun. This is consistent with the idea that a local dynamo process is responsible for the horizontal magnetic fields. A high-resolution potential field extrapolation shows that the majority of magnetic field lines from the kG-patches in the polar region are open with a fanning-out structure very low in the atmosphere, while in the quiet Sun, almost all the field lines are closed.