**FULL TITLE** ASP Conference Series, Vol. **VOLUME**, **YEAR OF PUBLICATION** **NAMES OF EDITORS** Spectropolarimetry of solar prominences

Abstract. A large set of high precision full-Stokes spectropolarimetric obser-vations of prominences in He-D3, H and H lines has been recorded with the ZIMPOL polarimeter at the Gregory-Coude Telescope in Locarno. The obser-vational technique allows us to obtain measurements free from seeing induced spurious eects. The instrumental polarization is well under control and taken into account in the data analysis. We present our observational results for each of the above-mentioned lines. Of particular interest is that most of our H mea-surements show anti-symmetric V proles that are a characteristic signature of the Zeeman eect in the prominence plasma. A Stokes inversion technique based on the quantum theory of the Hanle and Zeeman eects is being applied on observed Stokes proles in the He-D3 line in order to obtain information on the magnetic eld vector that connes the prominence plasma. 1