INSTITUTE FOR FUSION STUDIES Shear Flow Induced Wave Couplings in the Solar Wind STEFAAN POEDTS Centre for Plasma Astrophysics KULeuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium ANDRIA D. ROGAVA bastumani Astrophysical Observtory, Kazbegi ave. 2a, Tbilisi-380028, ep. of Georgia; & International Centre for Theoretical Physics, Trieste 1-34100, Italy and SWADESH M. MAHAJAN istitute for Fusion Studies, The University of Texas at Austin, Austin, Cexas 78712 USA; and International Centre for Theoretical Physics, Bieste 1-34100, Italy January 1998 THE UNIVERSITY OF TEXAS AUSTIN k,