The best method was sought for defining locally an electrostatic or an electromagnetic turbulence in a space plasma, based on the simultaneous measurment of several wave field components at several points in space. The turbulent field is supposed to be stationary in time and homogeneous in space. An estimate of a local field energy distribution, denoted F(&ohgr;,k), which specifies how the field energy observed by a limited number of satellities is distributed with regard to the angular frequency &ohgr; and to the wave number k, is derived from a generalization of the Capon [1969> high-resolution method. The quality of this estimate is deemed sufficient, as shown by examples of application to synthetic data. ¿American Geophysical Union 1990