太阳大气中矢量磁场信息的推导  

A DERIVATION OF THE INFORMATION OF VECTOR MAGNETIC FIELDS IN SOLAR ATMOSPHERE

作　　者：屈中权[1] 丁有济[1] 宜家余 

机构地区：[1]中国科学院云南天文台

出　　处：《天文学报》1994年第2期185-194,共10页Acta Astronomica Sinica

摘　　要：一种能从观测到的斯托克斯（Ｓｔｏｋｅｓ）轮廓中提取太阳表面矢量磁场信息的方法在本文中提出．它利用斯托克斯轮廓非线心的极值点处相应参量对波长的导数为零这一数学事实，假设表面附近磁场矢量及热力学参量的变化梯度足够小以致所考虑的极值点的波长位置不随深度改变或此变化可忽略而使得偏振辐射转移方程组得到极大的简化；再应用数值方法从此简化方程组中解出辐射出射表面附近的磁场矢量参数．通过拟合理论轮廓表明该法确实可以得到表面近似的磁场矢量信息，最后我们用此法对实测轮廓进行了比较成功的拟合．A new method is proposed to infer the information of the vector magnetic fields at solar surface from measured Stokes profiles. It makes use of the fact that the derivatives of Stokes parameters with respective to wavelength become zero at those extreme points. Also an assumption is made that the gradients of the thermodynamics and magnetic field parameters near the surface are so small that the displacements of those points can be ignored. In this way, the polarized radiative transfer equations can be reduced greatly. With aid of the numerical method. the reduced equations are solved to get the approximate values of the vector magnetic field at solar surface. This method proves feasible by the test of fitting theoretical Stokes profiles. At the end, we apply it to the measured profiles and a satisfactory result is obtained.

关 键 词：太阳 大气 磁场 谱线形成 矢量信息 

分 类 号：P182.7[天文地球—天文学]