MEASUREMENT OF THE FULL STOKES VECTOR OF HE-I-10830 ANGSTROM

First observations of the full Stokes vector in the upper chromosphere are presented. The He I 10830 Angstrom line, which has been shown to give reliable measurements of the line-of-sight component of the magne tic field vector, has been used for this purpose. It is shown that the difference between the appearance of chromospheric and photospheric m agnetic structures observed close to the solar limb is largely due to the difference in height to which they refer and projection effects. T he observations do suggest, however, that the magnetic field above sun spot penumbrae is somewhat more vertical in the chromosphere than in t he photosphere.