Distribution of Helical Properties of Solar Magnetic Fields
Distribution of Helical Properties of Solar Magnetic Fields
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DOI：
10.1088/1009-9271/3/3/257
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发表时间：
2003-06
期刊：
影响因子：
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通讯作者：
K. Kuzanyan;V. Lamburt;Hongqi Zhang;S. Bao
中科院分区：
文献类型：
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作者：
K. Kuzanyan;V. Lamburt;Hongqi Zhang;S. Bao
本文综述了太阳磁场的螺旋性质，如电流螺旋度和太阳活动区（ARs）磁场的扭曲，它们是太阳对流区(SCZ) α效应的观测示踪。通过对中国科学院国家天文台怀柔太阳观测站对活动区域的系统磁网观测资料的分析，得到了它们的空间分布信息。其主要性质是α效应的示踪剂在太阳赤道周围是不对称的。通过识别活动性区域的纵向偏移和各自的旋转速率，并考虑日震学已知的SCZ内的内部微分旋转规律，我们推导出了效应在深度上的分布。我们发现，α效应的值和符号在SCZ底部附近发生了变化，这与理论研究和数值模拟结果一致。我们还讨论了其他的规律，如经度、时间和磁场强度等，这些规律可以通过对它们的分析揭示出来。
We summarize studies of helical properties of solar magnetic fields such as current helicity and twist of magnetic fields in solar active regions (ARs), that are observational tracers of the alpha-eect in the solar convective zone (SCZ). Information on their spatial distribution is obtained by analysis of systematic mag- netographic observations of active regions taken at Huairou Solar Observing Station of National Astronomical Observatories of Chinese Academy of Sciences. The main property is that the tracers of the alpha-eect are antisymmetric about the solar equator. Identifying longitudinal migration of active regions with their individual rotation rates and taking into account the internal dierential rotation law within the SCZ known from helioseismology, we deduce the distribution of the eect over depth. We have found evidence that the alpha-eect changes its value and sign near the bottom of the SCZ, and this is in accord with the theoretical studies and numerical simulations. We discuss other regularities which can be revealed by fur- ther analysis such as possible dependence on longitude, time, and magnetic field strength, etc.