  CuGeO$_3$ undergoes a transition from a spin-Peierls phase to an
incommensurate phase at a critical field of $H_c\approx 12.5$ T. In the
high-field phase a lattice of solitons forms, with both structural and magnetic
components, and these have been studied using neutron scattering techniques.
Our results provide direct evidence for a long-ranged magnetic soliton
structure which has both staggered and uniform magnetizations, and with
amplitudes that are broadly in accord with theoretical estimates. The magnetic
soliton width, $\Gamma$, and the field dependence of the incommensurability,
$\delta k_{sp}$, are found to agree well with theoretical predictions.
