太阳大气中湍动场对CaⅡK线的影响  

EFFECTS OF TURBULENT VELOCITY FIELDS ON THE SOLAR CaII K LINE

作　　者：丁明德[1] 方成[1] 

机构地区：[1]南京大学天文系

出　　处：《空间科学学报》1992年第1期17-23,共7页Chinese Journal of Space Science

基　　金：国家自然科学基金;教委博士点基金

摘　　要：本文运用黑子半影模型研究了中介湍动场对太阳大气中CaII K线的影响。结果表明,空间分辨率的提高以及湍动元长度的增加均可导致观测谱线轮廓的不对称。当湍动元长度小于40km时,中介湍动场可以用微观和宏观湍动的组合来模拟,对大气模型及谱线轮廓的计算基本无影响;但当湍动元长度大于40km时,这种简化的处理方法可能导致大气模型上层色球温度偏高。文中通过一个计算实例,说明了在太阳大气模型计算中,只用中介湍动也可能使谱线的理论轮廓同观测基本相符。The effects of meso-turbulence on the solar CaII K spectral lines are studied in this paper The results show that,when the spatial resolution is improved or the correlation length of the turbulent field is increased,the observed line profiles exhibit more pronounce asymmetries.The micro-and macro-turbulence approximation can be safely used when the correlation length is less than 40 km,and it has no great influence on the model calculations.However,when the length is more than 40 km,this simple dichotomy yield some errors.An example is finally presented to certify that the computed profile can still match the observed one if only use the me-so-turbulent fields.

关 键 词：中介湍动 谱线轮廓 模型计算 太阳 

分 类 号：P182.3[天文地球—天文学]