  We report a polarization analysis of the eastern region of W50, observed with
the Australia Telescope Compact Array (ATCA) at 1.4 - 3.0 GHz. In order to
study the physical structures in the region where the SS433 jet and W50
interact, we obtain an intrinsic magnetic field vector map of that region. We
find that the orientation of the intrinsic magnetic field vectors are aligned
along the total intensity structures, and that there are characteristic,
separate structures related to the jet, the bow shock, and the terminal shock.
The Faraday rotation measures (RMs), and the results of Faraday Tomography
suggest that a high intensity, filamentary structure in the north-south
direction of the eastern-edge region can be separated into at least two parts
to the north and south. The results of Faraday Tomography also show that there
are multiple components along the line of sight and/or within the beam area. In
addition, we also analyze the X-ray ring-like structure observed with
XMM-Newton. While the possibility still remains that this X-ray ring is real,
it seems that the structure is not ring-like at radio wavelengths. Finally, we
suggest that the structure is a part of the helical structure that coils the
eastern ear of W50.
