Distribution of Helical Properties of Solar Magnetic Fields

作     者：KirillM.Kuzanyan VictorG.Lamburt Hong-QiZhang Shu-DongBao 

作者机构：NationalAstronomicalObservatoriesChineseAcademyofSciencesBeijing100012 IZMIRANHeliophysicdsLab.TroitskMoscowRegion142190Russia MoscowStateUniversityFacultyofMathematicsandMechanics119899MoscowRussia 

出 版 物：《Chinese Journal of Astronomy and Astrophysics》 (中国天文和天体物理学报（英文版）)

年 卷 期：2003年第3卷第3期

页      面：257-265页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：Supported by the National Natural Science Foundation of China 

主　　题：sun: activity sun: magnetic fields 

摘      要：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-effect in the solar convective zone (SCZ). Information on their spatial distribution is obtained by analysis of systematic magnetographic 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-effect are antisymmetric about the solar equator. Identifying longitudinal migration of active regions with their individual rotation rates and taking into account the internal differential rotation law within the SCZ known from helioseismology, we deduce the distribution of the effect over depth. We have found evidence that the alpha-effect 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 further analysis such as possible dependence on longitude, time, and magnetic field strength, etc.