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New visible and K-band polarization measurements on stars surroundingmolecular clouds in Orion A and stars in the BN vicinity are presented. Ourresults confirm that magnetic fields located inside the Orion A molecularclouds and in their close neighborhood are spatially connected. On and aroundthe BN object, we measured the angular offsets between the K-band polarizationdata and available submm data. We find high values of the polarization degree,P_{K}, and of the optical depth, \tau_{K}, close to an angular offset positionof 90^{\circ} whereas lower values of P_{K} and \tau_{K} are observed forsmaller angular offsets. We interpret these results as evidence for thepresence of various magnetic field components toward lines of sight in thevicinity of BN. On a larger scale, we measured the distribution of angularoffsets between available H-band polarization data and the same submm data set.Here we find an increase of <P_{H}> with angular offset which we interpret as arotation of the magnetic field by \lesssim 60^{\circ}. This trend generalizesprevious results on small scale toward and around lines of sight to BN and isconsistent with a twist of the magnetic field on a larger scale towards OMC-1.A comparison of our results with several other studies suggests that atwo-component magnetic field, maybe helical, could be wrapping the OMC-1filament.

Multi-Scale Analysis of Magnetic Fields in Filamentary Molecular Clouds in Orion A