Figure 5
Frequency spectra of the EMP with the 250 MHz cut-off low-pass filter applied from (a) the North-South and (b) East-West probes. Several peaks are visible in the spectra, with some corresponding extremely well with the theoretical fundamental chamber resonances and their harmonics (marked on the plot). The large quantity of conductive materials within the interaction chamber is expected to allow several other resonances to be supported, to which we attribute the presence of the other spectral peaks. A 1st degree Savitzky-Golay filter was applied in the frequency domain for noise-reduction.
