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The advancement of our understanding of MHD turbulence opens ways to developnew techniques to probe magnetic fields. In MHD turbulence, the velocitygradients are expected to be perpendicular to magnetic fields and this fact wasused by Gonsalvez-Casanova & Lazarian to introduce a new technique to tracemagnetic fields using velocity centroid gradients. The latter can be obtainedfrom spectroscopic observations. We apply the technique to GALFA HI survey dataand compare the directions of magnetic fields obtained with our technique withthe direction of magnetic fields obtained using PLANCK polarization. We findexcellent correspondence between the two ways of magnetic field tracing, whichis obvious via visual comparison and through measuring of the statistics ofmagnetic field fluctuations obtained with the polarization data and ourtechnique. This suggests that the velocity centroid gradients can provide areliable way of measuring of the foreground magnetic field fluctuations andthus provide a new way of separating foreground and CMB polarization signals.

Tracing interstellar magnetic field using velocity gradient technique: Application to Atomic Hydrogen data