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The structure and behaviour of barotropically unstable disturbances in the vicinity of the upper tropospheric easterly jet during the summer monsoon is studied numerically with a linearized barotropic vorticity equation on an equatorial Beta-plane. The easterly jet is approximated by a Bickley jet with a slow zonal variation, and the numerical results are compared with those of a simple theoretical model using the local phase speed and growth rate concepts. In the unstable region the resultantdoi:10.54302/mausam.v29i1.2896 fatcat:4efjygscy5axlawjkbye3yc2zy