Numerical simulations of a two-fluid jet at a magnetic null point in a solar arcade

ABSTRACT We study the formation and evolution of jets in solar atmosphere using numerical simulations partially ionized plasma. The two-fluid magnetohydrodynamic equations with ion+electron neutral hydrogen components are used two-dimensional Cartesian geometry. Numerical show that a localized non-linear Gaussian pulse ion pressures initially launched from magnetic null point potential arcade located below transition region quickly develops into shock due to decrease density height. propagates upwards corona lifts cold dense chromospheric plasma behind form collimated jet an inverted-Y shape. shape is connected topology point. also excites wake chromosphere, which leads quasi-periodic secondary shocks. shocks lift create lower corona. Ion fluids generally similar behaviour, but their relative velocity higher near upper part jets, enhanced temperature or heating ion–neutral collisions. Simulations may explain properties some observed atmosphere.