Analyses of CG and CID electric field waveforms in both time and frequency domains
The frequency spectra of the relatively wideband (160 Hz to 500 kHz) electric field waveforms from negative cloud-to-ground return strokes (-CGs) and compact intra-cloud-discharges (CIDs), at different distances, have been calculated.In order to obtain the frequency spectra, we used the electric field waveforms recorded at the Lightning Observatory in Gainesville (LOG), Florida by the Lightning Detection and Waveforms Storage System (LDWSS).The LDWSS has a bandwidth of 160 Hz to 500 kHz and GPS-timing.The horizontal distances to lightning discharges were computed based on data provided by the U.S.National Lightning Detection Network (NLDN).The fast Fourier transform (FFT) for each waveform was computed to generate the corresponding frequency spectrum.The analyses showed that the shape of CGs frequency spectra changes with distance, close CGs tend to have more energy at lower frequencies due to the electrostatic component, and far lightning spectra tend to be modulated by the waveguide (Ground-Ionosphere).On the other hand, the frequency spectra of CIDs do not change much with distance.Based on the shapes of frequency spectra we developed criteria to distinguish between CG and CID waveforms.
Lightning electric field lightning frequency spectra time domain frequency domain
Ad(o)nis Ferreira Raiol Leal Vladimir A.Rakov José Pissolato Filho
Brígida Ramati Pereira da Rocha,Gabriel de Oliveira,UFPA Belém, Brazil University of Florida Gainesville, USA UNICAMP Campinas, Brazil
国际会议
4th International Lightning Protection Symposium (ILPS2018第四届雷电防护国际研讨会)
深圳
英文
164-169
2018-10-24（万方平台首次上网日期，不代表论文的发表时间）