Abstract
Ninety-eight radio sources have been observed at lambda = 13 cm with interferometers having baselines of 6 to 8 x 10/sup 7/ wavelengths, either from California to Australia or Australia to South Africa, at various times between 1969 and 1974. Of these, 63 have been detected; indications are that they have some compact structure on an angular scale of 0.001'' or less. Comparisons are made between changes in the total flux densities of these sources and changes in the correlated flux densities from the interferometers. Resolution effects due to changes in structure on scales approximately equal to or greater than 0.001'' are evident in many cases, although some variable components remain smaller than this size. Examination of a complete sample of sources with centimeter-excess spectra shows a strong correlation between flux variations at 13 cm and the presence of compact structure. (auth)
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