Correlation effects in microwave observations of selected RS CVn-like stars

Sets of dual frequency microwave data on selected chromospherically active stars, from the Australia Telescope Compact Array, have been investigated f or their auto and cross-correlation effects. Comparison of cross-correlatio n peak values with theoretical expectation indicates a high degree of real physical connection between the emission at the pairs of frequencies (4.8 a nd 8.64 GHz) compared. This fact should help constrain models for the emiss ion mechanism. The timescale of observed time-shifts between the emissions at the two freq uencies is consistent, in general, with the underlying energization being p ropagated by magnetohydrodynamic waves in a compact turbulent medium. (C) 2 002 Published by Elsevier Science B.V.