Latitude Variation of Helicity in Solar Active Regions
Latitude Variation of Helicity in Solar Active Regions
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DOI：
10.1093/pasj/56.5.831
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发表时间：
2004-10
影响因子：
2.3
通讯作者：
M. Hagino;T. Sakurai
中科院分区：
文献类型：
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作者：
M. Hagino;T. Sakurai
我们研究了1992-2001年期间太阳上230个活动区的螺旋度。所使用的矢量磁图是由位于国家天文台三鹰校区的太阳耀斑望远镜获得的。螺旋度的纬度分布呈现负斜率，即北方（南）半球的区域分别倾向于呈现负（正）螺旋度，这与以往的研究结果一致。在螺旋度中看到的散射明显大于测量误差的预期，这意味着产生螺旋度的过程是随机的，湍流的性质。因此，对流运动必须在产生活动区的螺旋度中发挥重要作用。
We studied the current helicity of 230 active regions on the Sun during the period of 1992–2001. Vector magnetograms used were obtained with the Solar Flare Telescope, located at the Mitaka campus of the National Astronomical Observatory. The latitude distribution of helicity shows a negative slope; namely, the regions in the northern (southern) hemisphere tend to show a negative (positive) helicity, respectively, in agreement with previous studies. The scatter seen in the helicity is significantly larger than expected from the measurement errors, implying that the process generating the helicity is of random, turbulent nature. Therefore, convective motion must play an essential role in generating the helicity of active regions.