计算物理 ›› 2005, Vol. 22 ›› Issue (6): 85-89.

• 研究论文 • 上一篇    下一篇

太阳射电爆发中纤维精细结构频漂率的计算

张文娟1,2, 王蜀娟1, 宋国乡2, 颜毅华1   

  1. 1. 中国科学院国家天文台, 北京 100012;
    2. 西安电子科技大学理学院, 陕西 西安 710071
  • 收稿日期:2004-07-15 修回日期:2005-01-03 出版日期:2005-11-25 发布日期:2005-11-25
  • 作者简介:张文娟(1980-),女,山西阳泉,硕士生,主要从事应用数学方面的研究,西安金花北路4号西安工业学院数理系710032.100012.64859764,13571843725.
  • 基金资助:
    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

Frequency Drift Rate of Solar Radio Fiber Structures

ZHANG Wen-juan1,2, WANG Shu-juan1, SONG Guo-xiang2, YAN Yi-hua1   

  1. 1. National Astronomical Observatory, Chinese Academy of Science, Beijing 100012, China;
    2. School of Science, Xidian University, Xi'an 710071, China
  • Received:2004-07-15 Revised:2005-01-03 Online:2005-11-25 Published:2005-11-25

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-0.0410~-0.0138 GHz·s-1之间.

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

Abstract: 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.

Key words: solar radio fiber structure, wavelet transformation, cubic spline interpolation, linear regression

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