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We investigate the diagnostic potential of the spectral lines at 850 nm forunderstanding the magnetism of the lower atmosphere. For that purpose, we use anewly developed 3D simulation of a chromospheric jet to check the sensitivityof the spectral lines to this phenomenon as well as our ability to infer theatmospheric information through spectropolarimetric inversions of noisysynthetic data. We start comparing the benefits of inverting the entirespectrum at 850 nm versus only the Ca II 8542 A spectral line. We found abetter match of the input atmosphere for the former case, mainly at lowerheights. However, the results at higher layers were not accurate. After severaltests, we determined that we need to weight more the chromospheric lines thanthe photospheric ones in the computation of the goodness of the fit. The newinversion configuration allows us to obtain better fits and consequently moreaccurate physical parameters. Therefore, to extract the most from multi-lineinversions, a proper set of weights needs to be estimated. Besides that, weconclude again that the lines at 850 nm, or a similar arrangement with Ca II8542 A plus Zeeman sensitive photospheric lines, poses the best observingconfiguration for examining the thermal and magnetic properties of the lowersolar atmosphere.

Chromospheric polarimetry through multi-line observations of the 850 nm spectral region III: Chromospheric jets driven by twisted magnetic fields