关于天文大气折射的讨论  

On the Discussion of Astronomical Atmospheric Refraction

作　　者：冒蔚[1] 杨磊[1] 铁琼仙[1] 

机构地区：[1]中国科学院国家天文台云南天文台,昆明650011

出　　处：《天文学报》2008年第2期216-223,共8页Acta Astronomica Sinica

基　　金：云南省基金(2005A0010R)资助项目

摘　　要：通过比较天文大气折射级数表达形式和映射函数表达形式,认为对于一个具体的大气折射模型而言,前者的计算精度不会低于后者,理论推导的级数表达式则因为作了不同的近似,使收敛性较差;经过分析大气折射映射函数的母函数方法,认为这种方法不能体现地球物理和大气物理的特性;通过比较指出,采用某地特定的大气分布所建立的大气折射模型,不是各地都适用的,也不能用来评价其他的大气折射模型;为了提高修正精度,关键问题在于采用有效的方法,在不同方位直接测定瞬时大气折射值,建立本地的随方位而异的大气折射实测模型.The series expansion method and mapping function expansion method for astronomical refraction are analyzed in this paper. It is shown from the comparison between those two methods that the computational accuracy from the former one is not lower than that from the latter for a certain refraction model. The series expansion method in the theoretical derivation is often lower in astringency because of various approximations. It is also analyzed that the actual situations on the generator function method in the astronomical refraction mapping function can not indicate the characteristic of the geophysics and atmospheric physics. It is pointed out that the previous refraction model was built using a specific atmospheric model in a certain place and it is not suitable for all places, in particular, it can not be used judging other refraction model. The key to improve the correction accuracy is that the effective methods must be used while to determine directly the instantaneous refraction values and to build the azimuth-dependent observational model of the astronomical refraction.

关 键 词：天文仪器 方法与技术:大气效应 天体测量学 

分 类 号：P12[天文地球—天体测量]