Measurement and Statistical Analysis of Magnetic Fields Produced by Cloud Discharges

운방전에 의해 발생되는 자장의 계측과 통계적 분석

  • Published : 2005.06.01

Abstract

In this work, to obtain the detailed information about lightning electromagnetic field waveforms, the LabVIEW based-measurement system of time-changing magnetic fields was designed and constructed. The frequency bandwidth of the magnetic field measuring system ranges from 300 [Hz] to 1 [MHz], and the response sensitivity is 2.78 [mV/nT]. Data acquisition system with the resolution of 12 bits and memory capacity of 32 [Mbyte] was triggered by the magnetic field to be measured. The properties and parameters of the magnetic fields produced by cloud discharges were statistically investigated. The magnetic field waveforms radiated from cloud lighting discharges tend to be bipolar, with two or more narrow and several pulses superimposed on the initial front part. The recording length of the magnetic field measurement system is about 10 [ms]. The mean duration of cloud discharges is 1.3 [ms], and the number of outburst pulses for the period is 8 in average. The front times of the magnetic fields are 6.15 [$\mu$s] in average. The the zero-to-zero crossing times that is the initial half-cycle duration is widely dispersed and the mean value is 9.61 [$\mu$s], and the mean value of percentage depth of dip to opposite polarity is 41.1 [$\%$].

Keywords

Lightning;Cloud Discharges;Magnetic Field;Rise Time;Zero-Crossing Time

References

  1. C. D. Weidman, E. P. Krider, 'The Fine Structure of Lightning Return Stroke Wave Forms', J. Geo. Res. Vol.83, No. C12, pp.6239-6247, 1978 https://doi.org/10.1029/JC083iC12p06239
  2. M. A. Uman and E. P. Krider, 'A Review of Natural Lightning : Experimental Data and Modeling', IEEE Trans., Vol.EMC-24, No.2, pp.79-105, 1982 https://doi.org/10.1109/TEMC.1982.304006
  3. M. Ishii and J. Hojo, 'Statistics on Fine Structure of Cloud-to-Ground Lightning Field Waveforms', J. Geo., Res., Vol.94, No.D11, pp.267-274, 1989
  4. Y. T. Lin, M. A. Uman, and R. B. Standler, 'Lightning Return Stroke Models', J. Geo., Res., Vol. 85, No.C3, pp.1571-1583, 1980 https://doi.org/10.1029/JC085iC03p01571
  5. F. Serghei and S. Sangkassad, 'National Lightning location network-an alternative approach', IEEE Trans., Vol.2, No.21-25, pp.965-968, 2000 https://doi.org/10.1109/ISEMC.2000.874754
  6. E. O'Neill-Carrillo and J. Arroyo, 'The Atmospheric Phenomena Laboratory: connecting electrical and computer engineering through undergraduate research'. IEEE Tran., Vol.3, No.6-9, pp.s4c-7-s4c-12, 2002 https://doi.org/10.1109/FIE.2002.1158725
  7. 이복희, 길경석, 박동화, '루프형 센서를 이용한 측정계', 센서학회지, Vol. 4, No. 2, pp. 14-21, 1995
  8. B. H. Lee, et al., 'Characteristics of the Radiation Field Waveforms Produced by Lightning Return Strokes', Jpn. J. Appl. phys., Vol. 43, No. 7A, pp.4379-4385, 2004 https://doi.org/10.1143/JJAP.43.4379
  9. Bok-Hee Lee, Sun-hun Chang, Chang-Hwan Ahn, Seung-Chil Lee and Duk-Kyu jeon, 'Statistical Analysis of Electric and Magnetic Fields due to Multiple cloud Lightning Discharges', Proceedings of the International Workshop on High Voltage Engineering. Vol.II, pp19-24, 1999
  10. B. H. Lee, S. C. Lee, C. H. Ahn and T. Kawamura, 'Physical Properties of Radiation Fields Produced by Multiple In-cloud Lightning Discharges', Jpn. J. Appl. Phys., Vol. 40, No.1, pp.299-306, 2001 https://doi.org/10.1143/JJAP.40.299
  11. C. D. Wiedman and E. P. Krider, 'The Radiation Field Wave Forms Produced by Intracloud Lightning Discharge Processes', J. Geo., Res., Vol. 84, No. C6, pp.3159-3164, 1979 https://doi.org/10.1029/JC084iC06p03159
  12. E. P. Krider, G. J. Radda and R. C. Noggle, 'Regular Radiation Field Pulses Produced by Intracloud Lightning Discharges', J. Geo. Res., Vol. 80, No. 27, pp.3801 -3804, 1975 https://doi.org/10.1029/JC080i027p03801
  13. V. Cooray and S. Lundquist, 'Characteristics of the Radiation Fields form Lightning in Sri Lanka in the Tropics', J. Geo. Res., Vol. 90, No. D4, pp.6099-6109, 1985 https://doi.org/10.1029/JD090iD04p06099
  14. T. Ushio, et al., 'Characteristics of Pulse Trains Superimposed on the Electric Field Changes of Japanese Winter Lightning', T. IEE Japan, Vol. 116-B, No.4, pp.453-459, 1996