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Context: The determination of the magnetic field vector in quiescent solarprominences is possible by interpreting the Hanle and Zeeman effects inspectral lines. However, observational measurements are scarce and lack highspatial resolution. Aims: To determine the magnetic field vector configurationalong a quiescent solar prominence by interpreting spectropolarimetricmeasurements in the He I 1083.0 nm triplet obtained with the Tenerife InfraredPolarimeter installed at the German Vacuum Tower Telescope of the Observatoriodel Teide. Methods. The He I 1083.0 nm triplet Stokes profiles are analyzedwith an inversion code that takes into account the physics responsible of thepolarization signals in this triplet. The results are put into a solar contextwith the help of extreme ultraviolet observations taken with the Solar DynamicObservatory and the Solar Terrestrial Relations Observatory satellites.Results: For the most probable magnetic field vector configuration, theanalysis depicts a mean field strength of 7 gauss. We do not find localvariations in the field strength except that the field is, in average, lower inthe prominence body than in the prominence feet, where the field strengthreaches 25 gauss. The averaged magnetic field inclination with respect to thelocal vertical is 77 degrees. The acute angle of the magnetic field vector withthe prominence main axis is 24 degrees for the sinistral chirality case and 58degrees for the dextral chirality. These inferences are in rough agreement withprevious results obtained from the analysis of data acquired with lower spatialresolutions.

The magnetic field configuration of a solar prominence inferred from spectropolarimetric observations in the He I 10830 A triplet