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In this publication we continue the work started in Quintero Noda et al.(2017) examining this time a numerical simulation of a magnetic flux tubeconcentration. Our goal is to study if the physical phenomena that take placein it, in particular, the magnetic pumping, leaves a specific imprint on theexamined spectral lines. We find that the profiles from the interior of theflux tube are periodically dopplershifted following an oscillation pattern thatis also reflected in the amplitude of the circular polarization signals. Inaddition, we analyse the properties of the Stokes profiles at the edges of theflux tube discovering the presence of linear polarization signals for the Ca IIlines, although they are weak with an amplitude around 0.5% of the continuumintensity. Finally, we compute the response functions to perturbations in thelongitudinal field and we estimate the field strength using the weak fieldapproximation. Our results indicate that the height of formation of thespectral lines changes during the magnetic pumping process which makes theinterpretation of the inferred magnetic field strength and its evolution moredifficult. These results complement those from previous works demonstrating thecapabilities and limitations of the 850 nm spectrum for chromospheric Zeemanpolarimetry in a very dynamic and complex atmosphere.

Chromospheric polarimetry through multi-line observations of the 850 nm spectral region II: A magnetic flux tube scenario