The structure of the chromosphere - Properties pertaining to element fractionation

We review the structure and dynamics of the solar chromosphere with emphasi s on the quiet Sun and properties that are relevant to element fractionatio n mechanisms. Attention is given to the chromospheric magnetic field, its c onnections to the photosphere, and to the dynamical evolution of the chromo sphere. While some profound advances have been made in the "unmagnetized" c hromosphere, our knowledge of the magnetically controlled chromosphere, mor e relevant for the discussion of element fractionation, is limited. Given t he dynamic nature of the chromosphere and the poorly understood magnetic li nkage to the corona, it is unlikely that we will soon know the detailed pro cesses leading to FIP fractionation.