Abstract: During a subsorm in the magnetosphere,the aurora takes place with precipitating electrons into the polar region.At the same time a convective electric field is mapped from the magnetosphere into the ionospher of polar region.The inhomogenous thin layer of the ion convergence is produced by the action of the electric field.The Es-layer under the state of dynamic equilibrium and related it with the enhanced aurora layer is solved in this paper.In addition,the comparison between the results and the observation is also mode.