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We investigate how observations of synchrotron intensity fluctuations can beused to probe the sonic and Alfv\'enic Mach numbers of interstellar turbulence,based on mock observations performed on simulations of magnetohydrodynamicturbulence. We find that the structure function slope, and a diagnostic ofanisotropy that we call the integrated quadrupole ratio modulus, both depend onthe Alfv\'enic Mach number. However, these statistics also depend on theorientation of the mean magnetic field in the synchrotron emitting regionrelative to our line of sight, and this creates a degeneracy that cannot bebroken by observations of synchrotron intensity alone. We conclude that thepolarization of synchrotron emission could be analyzed to break thisdegeneracy, and suggest that this will be possible with the Square KilometreArray.

Radio Synchrotron Fluctuation Statistics as a Probe of Magnetized Interstellar Turbulence