The magnetic fields in spicules and prominences as inferred from spectropolarimetric observations of the Hanle and Zeeman effects in the He-D$_3$ multiplet.

A large set of high precision full-Stokes spectropolarimetric observations of the He-D$_3$ line in chromospheric spicules and prominences recorded with the ZIMPOL polarimeter at the Gregory-Coud\'e Telescope in Locarno is interpreted according to the quantum theory of the Hanle and Zeeman effects with the aim of obtaining information on the magnetic field vector. To this end, we make use of a suitable Stokes inversion technique. The results are presented giving emphasis on a few particularly interesting measurements which show clearly the operation of the Hanle and Zeeman effects.