LONG-RANGE INTENSITY CORRELATION IN RANDOM-MEDIA

Measurements of the spatial and spectral intensity correlation of microwave radiation allow us to identify the leading terms in a perturbation expansion of the correlation function. This function is shown to depend upon two average properties of damped eigenstates of the random medium. These are the average level width and the number of eigenstates within the level width whose inverse is the expansion parameter for the correlation function. © 1990 The American Physical Society.