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Magnetic field topology, thermal structure and plasma motions are the threemain factors affecting the polarization signals used to understand our star. Inthis theoretical investigation, we focus on the effect that gradients in themacroscopic vertical velocity field have on the non-magnetic scatteringpolarization signals, establishing the basis for general cases. We demonstratethat the solar plasma velocity gradients have a significant effect on thelinear polarization produced by scattering in chromospheric spectral lines. Inparticular, we show the impact of velocity gradients on the anisotropy of theradiation field and on the ensuing fractional alignment of the CaII levels, andhow they can lead to an enhancement of the zero-field linear polarizationsignals. This investigation remarks the importance of knowing the dynamicalstate of the solar atmosphere in order to correctly interpretspectropolarimetric measurements, which is important, among other things, forestablishing a suitable zero field reference case to infer magnetic fields viathe Hanle effect.

Scattering polarization in the CaII Infrared Triplet with Velocity Gradients