摘要
太阳射电爆发中观测到的纤维精细结构携带着爆发初期磁场活动的小尺度信息.对原始的纤维结构观测资料进行算法处理,分析纤维结构的重要特征———频率漂移率.利用小波变换提取宁静太阳背景信息,用原始频谱图减去背景并经过阈值处理,纤维结构被很好地分离出来,然后在每个通道上找出构成纤维结构的连续片断,利用三次样条插值法对每个连续片断拟合其时间-强度关系,确定最大强度对应的时间,用线性回归方法计算纤维结构的频漂率.对2002年4月21日的一组纤维结构事件进行计算,得出其平均频漂率在-0.041 0^-0.013 8 GHz.s-1之间.
The fiber fine structure in solar radio bursts carries small-scale magnetic field information in the initial phase of the burst. We deal with fiber structures to analyze the frequency drift rate. The background is obtained by a wavelet transformation. With a subtraction of the background and a threshold processing, the fiber structures are seperated. We select continuous segments in each channel. The cubic spline interpolation is used to fit the intensity-time relation with which the moments of intensity maxima are determined. Finally, the drift rate is calculated with linear regression. The algorithm is used to calculate frequency drift rate of the radio fiber event on 21-April-2002. The mean frequency drift rate obtained is beween -0.041 0～-0.013 8 GHz·s^-1.
出处
《计算物理》
EI
CSCD
北大核心
2005年第6期555-559,共5页
Chinese Journal of Computational Physics
基金
中国科学院
科技部973项目(G2000078403)
自然科学基金项目(19973008
19833050
10225313)资助项目
关键词
太阳射电纤维结构
小波变换
三次样条插值
线性回归
solar radio fiber structure
wavelet transformation
cubic spline interpolation
linear regression
