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Due to the inevitable accumulation of the observed information in thedirection of the line of sight, it is difficult to measure the local magneticfield of MHD turbulence. However, the correct understanding of the localmagnetic field is a prerequisite for reconstructing the Galactic 3D magneticfield. We study how to reveal the local magnetic field direction and the eddyanisotropy on the basis of the statistics of synchrotron polarizationderivative with respect to the squared wavelength $dP/d\lambda^2$. In the lowfrequency and strong Faraday rotation regime, we implement numericalsimulations in the combination of multiple statistic techniques, such asstructure function, quadrupole ratio modulus, spectral correlation function,correlation function anisotropy and spatial gradient techniques. We find that(1) statistic analysis of $dP/d\lambda^2$ indeed reveals the anisotropy ofunderlying MHD turbulence, the degree of which increases with the increase ofthe radiation frequency; (2) the synergy of both correlation functionanisotropy and gradient calculation of $dP/d\lambda^2$ enables the measurementof the local magnetic field direction.

Studying the local magnetic field and anisotropy of magnetic turbulence by synchrotron polarization derivative