Fig. 4 | Nature Communications

Fig. 4

From: Supersonic plasma turbulence in the laboratory

Fig. 4

Spectral index of density and velocity turbulence. The scaling exponent of the density power spectrum, P(k) (solid markers), and the velocity power spectrum, E(k) (open markers) is plotted against the turbulent Mach number. The results from this experiment are plotted in blue, and correspond to the times t = 500, 600, and 700 ns. Shown in red are hydrodynamic results from Kim & Ryu18 (circles), Kritsuk et al.8 (diamonds), Squire and Hopkins32 (star), Konstandin et al.33 (dotted line), and Federrath et al.30 (triangle). In green are astrophysical observations of the scaling exponent of the density power spectrum of the Orion B MC15 (star), the density power spectrum of the Perseus MC16,17 (square), and the velocity power spectrum of the Perseus MC29 (square). The Mach number error bar is a consequence of uncertainties in the measurement of the thermodynamic conditions of the plasma (see Fig. 2). The error bars for the density spectral index show the variation across the four regions of the plasma highlighted in Fig. 2b, and the error bars in the velocity spectral index were found by shifting the Fourier transform window by 20 ns in either direction

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