太阳线性无力场评注和快速傅氏分析法的应用

Comments on Solar Linear Force-Free Field and Application of FFT Analysis

首先对30年来用无力场计算太阳活动区磁场方法作了一些评注,特别研究了线性无力场解中的几个误区.提出了准线性无力场方法并探讨了快速傅氏变换在线性无力场计算中的应用.以2000年9月15日NOAA 9165活动区磁场为例,应用3种不同的方法计算出磁力线走向,然后同紫金山天文台赣榆观测站观测的精细Hα图形对比.

Some comments are made on the computation of solar active region magnetic field in the last thirty years, especially on some errors in linear force-free field representations. A new method based on quasi-linear force-free field is suggested. Also, fast Fourier transformation applied to linear force-free field computation is re-examined. As an example, the field configuration of NOAA 9165 active region is computed, using three different methods. The comparison between the computed results and the fine Hα- filtergram observed at Gan-Yu station of purple Mountain observatory is made.