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This paper studies how to employ synchrotron emission gradient techniques toreveal the properties of the magnetic field within the interstellar media.Based on data cubes of three-dimensional numerical simulations ofmagnetohydrodynamic turbulence, we explore spatial gradients of synchrotronemission diagnostics to trace the direction of the magnetic field. According toour simulations, multifarious diagnostics for synchrotron emission caneffectively determine the potential direction of projected magnetic fields.Applying the synergies of synchrotron diagnostic gradients to the archive datafrom the Canadian Galactic Plane Survey, we find that multifarious diagnostictechniques make consistent predictions for the Galactic magnetic fielddirections. With the high-resolution data presently available from LowFrequency Array for radio astronomy and those in the future from the SquareKilometer Array, the synergies of synchrotron emission gradients are supposedto perform better in tracing the actual direction of interstellar magneticfields, especially in the low-frequency Faraday rotation regime wheretraditional synchrotron polarization measure fails.

Tracing magnetic fields by the synergies of synchrotron emission gradients