POLAR FIELD REVERSAL OBSERVATIONS WITH HINODE
POLAR FIELD REVERSAL OBSERVATIONS WITH HINODE
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DOI：
10.1088/0004-637x/753/2/157
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发表时间：
2012-05
期刊：
影响因子：
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通讯作者：
D. Shiota;S. Tsuneta;M. Shimojo;N. Sako;D. Orozco Suárez;R. Ishikawa
中科院分区：
文献类型：
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作者：
D. Shiota;S. Tsuneta;M. Shimojo;N. Sako;D. Orozco Suárez;R. Ishikawa
我们一直在监测太阳极地磁场的年度变化与太阳光学望远镜日之出，以记录其演变和预期的逆转接近太阳最大。自动识别磁通量图中的所有磁块，以获得作为每个磁块的总磁通量的函数的数量密度和磁通量密度。每个贴片检测到的磁通量范围超过四个数量级（1015-1020 Mx）。在两极地区的磁通量的高端比安静的太阳大一个数量级，接近孔隙。几乎所有的大补丁（1018 Mx）具有相同的极性，而较小的补丁有一个公平的平衡，两个极性。因此，整个极区的极性仅由大的磁集中决定。在当前太阳活动周期的缓慢上升阶段，极地地区的净通量明显减少。北极地区的减少速度比南极地区快。净通量的减少是由于大通量集中的数量和大小减少以及低纬度出现极性相反的斑块造成的。相比之下，我们没有看到与较小斑块（<1018 Mx）相关的磁通量的时间变化以及2008-2012年期间的水平磁场。
We have been monitoring yearly variation in the Sun's polar magnetic fields with the Solar Optical Telescope aboard Hinode to record their evolution and expected reversal near the solar maximum. All magnetic patches in the magnetic flux maps are automatically identified to obtain the number density and magnetic flux density as a function of the total magnetic flux per patch. The detected magnetic flux per patch ranges over four orders of magnitude (1015–1020 Mx). The higher end of the magnetic flux in the polar regions is about one order of magnitude larger than that of the quiet Sun, and nearly that of pores. Almost all large patches (⩾1018 Mx) have the same polarity, while smaller patches have a fair balance of both polarities. The polarity of the polar region as a whole is consequently determined only by the large magnetic concentrations. A clear decrease in the net flux of the polar region is detected in the slow rising phase of the current solar cycle. The decrease is more rapid in the north polar region than in the south. The decrease in the net flux is caused by a decrease in the number and size of the large flux concentrations as well as the appearance of patches with opposite polarity at lower latitudes. In contrast, we do not see temporal change in the magnetic flux associated with the smaller patches (<1018 Mx) and that of the horizontal magnetic fields during the years 2008–2012.