Аннотация:A dayside magnetopause model is presented as an alternative to the well-known Roelof and Sibeck model. Model parameters are the same: solar wind dynamic pressure and Bz-component of the interplanetary magnetic field. The main differences and features of the model are the larger statistics and wider effective range of model parameters and the different method of the data treatment. The first is due to geosynchronous satellite magnetopause crossings added to the basic data on high-apogee crossing. The second is based on a physical approach to the analysis of the data. An asymmetric dayside magnetopause shape during disturbed solar wind condition and the pressure balance change manner during strong negative Bz were derived from geosynhronous data analysis.