Rotating vector model for magnetars

The modification of the rotating vector model in case magnetars are calculated. Magnetars may have twisted magnetic field compared with normal pulsars. polarization position angle will change a field. For dipole field, we found that both vertically and horizontally. During untwisting process magnetar magnetosphere, modifications evolve time monotonously. This explain evolution PSR J1622-4950 XTE J1810-197. relation between emission point line sight also change. We suggest every magnetospheric models calculate corresponding changes their models. Order magnitude estimation formula for doing this is given. opens possibility to extract geometry from radio observations.