  The effect of external fluctuations on the formation of spatial patterns is
analysed by means of a stochastic Swift-Hohenberg model with multiplicative
space-correlated noise. Numerical simulations in two dimensions show a shift of
the bifurcation point controlled by the intensity of the multiplicative noise.
This shift takes place in the ordering direction (i.e. produces patterns), but
its magnitude decreases with that of the noise correlation length. Analytical
arguments are presented to explain these facts.
