SUMMARY
In this paper the behaviour of unsteady flow of viscous incompressible andelectrically conducting Rivlin Ericksen fluid past a semi-infinite vertical porousplate having variable permeability under thermal radiation effects is examined.Further the time dependent suction is assumed at the plate which is movingwith constant velocity whereas the free stream velocity is assumed to beoscillating with time. The dimensionless governing equations for the fluidflow under investigation are reduced to set of ordinary differential equationsusing two term harmonic and non-harmonic functions and solved analyticallyunder relevant boundary conditions. Further the analytical results obtainedfor velocity, temperature and concentration profiles are evaluated numericallyand their variation with different flow parameters are shown graphically. Also,the variation behaviour of Skin friction, Nusselt number and Schmidt numberalong with their amplitudes and phase angles for pertinent parameters isdisplayed graphically.