Volume 35 Issue 3
May  2015
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JIANG Su, ZHANG Qilin, HUANG Kaili, CHEN Yuan, SU Jianfeng, QIN Wei. Multifractal Analysis of ELF Transient Events Based on MF-DFA[J]. Journal of Space Science, 2015, 35(3): 324-329. doi: 10.11728/cjss2015.03.324
Citation: JIANG Su, ZHANG Qilin, HUANG Kaili, CHEN Yuan, SU Jianfeng, QIN Wei. Multifractal Analysis of ELF Transient Events Based on MF-DFA[J]. Journal of Space Science, 2015, 35(3): 324-329. doi: 10.11728/cjss2015.03.324

Multifractal Analysis of ELF Transient Events Based on MF-DFA

doi: 10.11728/cjss2015.03.324
  • Received Date: 2014-07-30
  • Rev Recd Date: 2015-03-24
  • Publish Date: 2015-05-15
  • 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.

     

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