The Magnetic Landscape of the Sun's Polar Region
The Magnetic Landscape of the Sun's Polar Region
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DOI：
10.1086/592226
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发表时间：
2008-07
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影响因子：
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通讯作者：
S. Tsuneta;K. Ichimoto;Y. Katsukawa;B. Lites;K. Matsuzaki;S. Nagata;D. Súarez;T. Shimizu;M. Shimojo;R. Shine;Y. Suematsu;T. Suzuki;T. Tarbell;A. Title
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文献类型：
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作者：
S. Tsuneta;K. Ichimoto;Y. Katsukawa;B. Lites;K. Matsuzaki;S. Nagata;D. Súarez;T. Shimizu;M. Shimojo;R. Shine;Y. Suematsu;T. Suzuki;T. Tarbell;A. Title
我们目前的观测是前所未有的空间分辨率，视野和偏振精度的太阳极地地区的磁景观。它们是用日之出号上的太阳光学望远镜进行的。利用Milne-Eddington反演，我们发现了许多垂直取向的磁通量管，其场强为1 kG，分布在70° ~ 90°的纬度上。它们都具有相同的极性，与极地地区的全球极性相一致。观察到的磁场矢量偏离通量元素的中心，与磁场的观点是一致的，随着高度的扩大和扇出。极地地区也被发现有无处不在的水平场。极地地区是快速太阳风的来源，太阳风沿着单极日冕磁场传播，而日冕磁场的光球源显然是根植于强场的垂直通量斑块。我们推测，在光球-日冕边界附近具有大膨胀的垂直通量管可以作为加速太阳风的阿尔文波的有效烟囱。
We present observations of the magnetic landscape of the polar region of the Sun that are unprecedented in terms of spatial resolution, field of view, and polarimetric precision. They were carried out with the Solar Optical Telescope aboard Hinode. Using a Milne-Eddington inversion, we find many vertically oriented magnetic flux tubes with field strengths as strong as 1 kG scattered in latitude between 70° and 90°. They all have the same polarity, consistent with the global polarity of the polar region. The field vectors are observed to diverge from the centers of the flux elements, consistent with a view of magnetic fields that are expanding and fanning out with height. The polar region is also found to have ubiquitous horizontal fields. The polar regions are the source of the fast solar wind, which is channeled along unipolar coronal magnetic fields whose photospheric source is evidently rooted in the strong-field, vertical patches of flux. We conjecture that vertical flux tubes with large expansion around the photospheric-coronal boundary serve as efficient chimneys for Alfvén waves that accelerate the solar wind.