简单α效应的α-ω发电机解和活动区涡度的观测  

α-ω dynamo solution with simple α-effect and observation of vorticity in active regions

作　　者：高裕[1] GAO Yu(Key Laboratory of Solar Activity,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]中国科学院国家天文台太阳活动重点实验室,北京100101

出　　处：《中国科学：物理学、力学、天文学》2020年第4期17-22,共6页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:11473039,11103037,11273034,11178005,41174153,11173033,11427901,11673033);国家重点基础研究发展计划(编号:2000078401,2006CB806301)资助项目。

摘　　要：本文介绍了一个基本的α-ω发电机的数值解,探讨了这种模型中极向场和环向场耦合形成的螺度表征量随太阳活动周的变化,与之前观测中所呈现的螺度参数随纬度和时间变化的特征相吻合.其后,使用太阳动力学天文台日震磁场成像仪的时距日震学方法获得的24太阳活动周的矢量速度场,计算了平均涡度随纬度和时间的变化,观测结果显示涡度在南北半球的符号有相反的特征,另外, 2010–2016平均涡度随纬度逐年的平均变化显示了在不同年份,轮廓线显然不完全重叠.这表示太阳上实际的流体涡旋运动可能存在更为复杂的与时间有关的过程.This paper is aimed to introduce the numerical solution of the α-ω dynamo. We discuss the variation of helicity that is formed by coupling the poloidal with the toroidal magnetic field along with the solar cycle. The characteristics are consistent with the observational results of helicity presented in a previous study. Thereafter, we use the pipeline of vector velocity field obtained with the time-distance method for SDO/HMI to compute the distribution and evolution of the vorticity. The result shows that the sign of the vorticity has opposite signs in the southern and northern hemisphere. In addition, The mean vorticity shows non-fully-superposed latitudinal profiles. It indicates that there may be more complicated time-dependent vortex motion in the solar interior than proposed here.

关 键 词：太阳 发电机 螺度 

分 类 号：TM31[电气工程—电机]