Current Helicity and Twist as Two Indicators of the Mirror Asymmetry of Solar Magnetic Fields

被引：0
作者：
D. Sokoloff
H. Zhang
K. M. Kuzanyan
V. N. Obridko
D. N. Tomin
V. N. Tutubalin
机构：
[1] Chinese Academy of Sciences,National Astronomical Observatories
[2] Moscow State University,Department of Physics
[3] IZMIRAN,School of Mathematics
[4] University of Leeds,Department of Mechanics and Mathematics
[5] Moscow State University,undefined
来源：
Solar Physics | 2008年 / 248卷
关键词：
Solar activity; Solar magnetic fields;
D O I：
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中图分类号：
学科分类号：
摘要：
A comparison between the two tracers of magnetic field mirror asymmetry in solar active regions – twist and current helicity – is presented. It is shown that for individual active regions these tracers do not possess visible similarity but averaging by time over the solar cycle, or by latitude, reveals similarities in their behavior. The main property of the data set is antisymmetry over the solar equator. Considering the evolution of helical properties over the solar cycle we find signatures of a possible sign change at the beginning of the cycle, though more systematic observational data are required for a definite confirmation. We discuss the role of both tracers in the context of solar dynamo theory.
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页码：17 / 28
页数：11
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