Modeling seasonal and diurnal effects on ionospheric conductances, region-2 currents, and plasma convection in the inner magnetosphere

摘要: [1] The present study focuses on a modeling of the seasonal and diurnal effects dynamics coupled magnetosphere-ionosphere system under different solar illumination conditions, to try reproduce some observations concerning region 2 (R2) field-aligned currents (FAC). This is performed by introducing in Ionosphere Magnetosphere Model (IMM) Earth's rotation axis tilt, dipole tilt an eccentric dipole. The simulated patterns R2 FAC agree rather well with observations. In particular dayside density two times greater summer hemisphere than winter one. results show that affects distributions Pedersen conductances 28.5–52.8% do not have much influence distribution magnetospheric plasma, which modified only 0.9–3.9%. variations induced are same order magnitude, 5.5–29% for 0.4–7.1% plasma. They modulate interhemispheric asymmetry 26–59%. induces increase (decrease) daily factor 1.2–2.3 Southern (Northern) Hemisphere, irrespective season, contributes between hemispheres. ion maximum pressure electron energy flux at December solstice March September equinoxes, but decrease June solstice. maximal variation plasma amounts 6.7% These underline importance considering three time.