Magnetopause Position Dependence on the Interplanetary Magnetic Field B_z-Component. Analysis of the Pressure Balance Equation

摘要

Analysis of the available data set, containing numerous intersections of the magnetopause by different satellites over more than 30 years, leads to the conclusion, that the form of the magnetopause should be approximated by a more complicated surface than those of the 2~(nd) order (ellipsoid, paraboloid). The form of this surface is not only a fuction of pressure but also of the B_z IMF component. We used data on the change of the magnetopause form induced by variations of interplanetary medium parameters to analyze the local contribution of external sources to the geomagnetic field at the magnetopause as well as the variation of this contribution with changes in the magnetopause point location.