  Proving the magnetic configuration of solar spicules has hitherto been
difficult due to the lack of spatial resolution and image stability during
off-limb ground-based observations. We report spectropolarimetric observations
of spicules taken in the He I 1083 nm spectral region with the Tenerife
Infrared Polarimeter II at the German Vacuum Tower Telescope of the
Observatorio del Teide (Tenerife; Canary Islands; Spain). The data provide the
variation with geometrical height of the Stokes I, Q, U, and V profiles whose
encoded information allows the determination of the magnetic field vector by
means of the HAZEL inversion code. The inferred results show that the average
magnetic field strength at the base of solar spicules is about 80 gauss and
then it decreases rapidly with height to about 30 gauss at a height of 3000 km
above the visible solar surface. Moreover, the magnetic field vector is close
to vertical at the base of the chromosphere and has mid inclinations (about 50
degree) above 2 Mm height.
