THE TRANSVERSE COHERENCE FUNCTION AT NORSAR OVER A WIDE-RANGE OF SEPARATIONS

We have used data from the 80-km-diameter NORSAR array and the 3-km-di ameter NORESS array to determine the Transverse Coherence Function (TC F) of arrival time for spatial separations ranging from a few hundred meters to 80 km. To accomplish our objective, we have devised a method to combine data from arrays of different aperture. The procedure is b ased on information about rms fluctuations and rms tilts on each array . Synthetic fluctuation fields with different statistical properties w ere generated to test the combination method. Our results for the TCF from NORSAR and NORESS are in reasonable agreement with the prediction s of the Flatte-Wu model of heterogeneities under NORSAR.