中文核心期刊
CNKI期刊全文数据库
中国科学引文数据库(CSCD)源期刊
中国科技论文统计源期刊
万方数据知识服务平台
英国《科学文摘》(SA)
美国化学文摘(CA)
俄罗斯《文摘杂志》(AJ)
德国《天文学与天体物理学文摘》(AAA)
英国《中国天文学和天体物理学》(SCI收录)全文摘译期刊之一
《中国学术期刊文摘》
《中国物理文摘》
《中国天文学文摘》

空间科学学报 ›› 2015, Vol. 35 ›› Issue (3): 324-329.doi: 10.11728/cjss2015.03.324

• 日球层物理和太阳系探测 • 上一篇    下一篇

基于MF-DFA的极低频瞬态事件多重分形分析

姜苏1,2, 张其林1,2, 黄凯丽1,2, 陈媛1,2, 苏建峰1,2, 秦微1,2   

  1. 1. 南京信息工程大学气象灾害预报预警与评估协同中心中国气象局气溶胶与云降水重点开放实验室 南京 210044;
    2. 南京信息工程大学大气物理学院 南京 210044
  • 收稿日期:2014-07-30 修回日期:2015-03-24 出版日期:2015-04-15 发布日期:2015-04-29
  • 基金资助:

    国家自然科学基金项目(40975002)和江苏高校优势学科建设工程项目(PAPD)共同资助

Multifractal Analysis of ELF Transient Events Based on MF-DFA

JIANG Su1,2, ZHANG Qilin1,2, HUANG Kaili1,2, CHEN Yuan1,2, SU Jianfeng1,2, QIN Wei1,2   

  1. 1. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044;
    2. College of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044
  • Received:2014-07-30 Revised:2015-03-24 Online:2015-04-15 Published:2015-04-29

摘要:

利用三个测站实测极低频全球闪电活动背景信号南北及东西方向磁场分量资料, 应用多重分形方法对极低频瞬态事件发生时前1s背景信号中的长程关联性及多重分形特征进行了分析. 发现极低频瞬态事件发生时, 最大脉冲前1s背景信号南北及东西方向磁场均具有长程关联性和多重分形特征. 其中南北方向最小标度指数0.15 < amin< 0.22, 分形谱宽度1.09 < Δa < 1.51; 东西方向最小标度指数0.23 < amin< 0.59, 分形谱宽度0.75 < Δa < 0.99. 多重分形谱参数Δaamin可以很好地自动识别Q-burst发生.

关键词: 多重分形, Q-burst, 去势涨落分析, 分形谱

Abstract:

In this paper, the magnetic field components totally continued 10 seconds using measured ELF global lightning activity background signal. The measuring signal sensor includes a pair of horizontal antenna which are orthogonal to each other and a spherical antenna with vertical placement. The horizontal antenna is for receiving ELF horizontal magnetic (HNS, HEW) signal of north-south and east-west directions, while the vertical antenna is for receiving ELF vertical electric field signal. By using the magnetic field component in both north-south and east-west direction of the observational extremely low frequency background signal of global lightning activity, and based on MF-DFA (Multifractal Detrended Fluctuation Analysis) multiple fractal method to analyze the long range correlation and multiple fractal characteristic of the background signal one second before the Q-burst occurs. Then, it is found that the magnetic field in the north-south, east-west direction of the maximum impulse one second before the Q-burst occurs has a long range correlation and multiple fractal characteristics. Among them, the minimum scaling exponent of the north-south direction is 0.15 < amin < 0.22, fractal spectrum width is 1.09 < Δa < 1.51; the minimum scaling exponent of the east-west direction is 0.23 < amin < 0.59, fractal spectrum width is 0.75 < Δa < 0.99. The multiple fractal spectrum parameters Δa, amin can automatically identify the occurrence of Q-burst excellently.

Key words: Multifractal, Q-burst, Castration fluctuation analysis, Fractal spectrum

中图分类号: