Maximum Entropy Spectral Analysis of Time-Series Data from Combustion MHD Plasma

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Abstract
The maximum entropy method (MEM) was applied to the time-series intensity data of the total light radiation from a combustion MHD plasma, and power spectral densities with many characteristic peaks were obtained in the range of a few kHz to ca. 30 kHz. Minimization of FPE, AIC, and CAT was employed to determine the optimum prediction-error filter order required for the MEM spectral analysis. Using the plasma flow velocity of 250 m/s obtained from cross-correlation function analysis, the frequency spectrum of the temperature was transformed to the wave-number-dependent power spectral density, in which a k -5/3-dependence was found in the k-range corresponding to the inertial subrange.