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Context. Understanding the close relationship between the plasma and themagnetic field is important to describe and explain the observed complexdynamics of solar prominences. Aims. We determine if a close relationshipbetween plasma and magnetic field parameters measured in a well-observed solarprominence with high spatial resolution can be found. Methods. We select aprominence observed on 15 July 2014 from space (IRIS, Hinode, SDO) and from theground (THEMIS). We perform a robust co-alignment of the data sets using a 2Dcross-correlation technique. We derive the magnetic field parameters fromspectropolarimetric measurements of the He I D3 line taken by THEMIS. Lineratios and line-of-sight velocities from the Mg II h and k lines observed byIRIS are compared with magnetic field strength, inclination and azimuth.Electron densities are calculated using Hinode/EIS Fe XII line ratios and alsocompared with THEMIS and IRIS data. Results. We find Mg II k/h ratios of around1.4 everywhere, similar to values found previously in prominences. We also findthat the magnetic field is strongest (around 30 G) and predominantly horizontalin the tornado-like legs of the prominence. The k3 Doppler shift is found to bebetween +/- 10 km/s everywhere. Electron densities at a temperature of 1.5e6 Kare found to be around 1e9 /cm3. No significant correlations are found betweenthe magnetic field parameters, and any of the other plasma parameters inferredfrom EUV spectroscopy, which may be explained by the large differences in thetemperatures of the lines used in this study. Conclusions. This is the firsttime that a detailed statistical study of plasma and magnetic field parametershas been carried out at high spatial resolution in a prominence. Our resultsprovide important constraints on future models of the plasma and magnetic fieldin these structures.

Comparing UV/EUV line parameters and magnetic field in a quiescent prominence with tornadoes