Based on shell theory of debris and interactions between debris and atmospheric molecules at high altitudes

a method was developed to model HANE debris movement under the effect of geomagnetic field and atmosphere.The charge-exchange section item and collision-ionization section item in the magnetohydrodynamic equation showed the stop action of atmosphere.The Lagrangian differential method was applied to solve the magnetohydrodynamic equation of debris motion in the geomagnetic field.Debris cloud expansion of a typical high altitude detonation was simulated.Expansion scale

velocity

pressure and temperature of early debris in deferent direction were given.