An examination of the effect of dipole tilt angle and cusp regions on the shape of the dayside magnetopause

摘要: The shape of the dayside magnetopause has been studied from both a theoretical and an empirical perspective for several decades. Early studies assumed inviscid interaction normal pressure balance along entire boundary, with interior magnetic field currents being solved self-consistently iteratively, using Biot-Savart Law. derived shapes are complicated, due to asymmetries caused by nature dipole direction flow solar wind. These models contain weak region or cusp through which wind direct access ionosphere. More recent MHD model results have indicated that closed lines magnetosphere can be dragged tailward terminator plane, so there is no magnetosheath Most approximated simple conic section specified number coefficients, determined least squares fits spacecraft crossing positions. Thus most resemble more than complex models. In this work, we examine empirically effect regions on magnetopause, test accuracy these We find during periods northward IMF, crossings close one observed at distances closer Earth in equatorial plane. This result consistent suggests less viscous many