This paper describes the effect of the thermal radiation on peristaltic transportation of a couple stress fluid in an asymmetric channel in the presence of external magnetic field. The governing equations are reduced by using very low Reynolds number and long-wavelength rough calculations. Closed-form analytical expressions for axial velocity and temperature distribution have been obtained. Graphs are presented and analyzed for various parameters involved in the problem.

peristalsis, couple stress, thermal radiation, tapered asymmetric channel.