Magnetopause speed vs the ion motion inside the boundary layer

The magnetopause plays a vital role in the magnetospheric system because it controls the flow of mass, energy, and momentum from the solar wind to the magnetosphere. Variations in upstream solar wind conditions directly affect the magnetopause position, shape, and motion. We propose that the ion speed component aligned with the magnetopause normal direction inside the magnetopause boundary layers should be relate to the magnetopause speed. Our study aims to comprehensively understand the profiles of plasma parameters in the magnetopause boundary layer, and then to find a better method for estimation of the speed of magnetopause motion by using a single-satellite observation. Such a new approach can substantially increase the number of observations of the magnetopause speed and help us to understand the magnetopause motion in more detail.