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Natural SciencesEarth SciencesPhysicsElectromagnetismGeomagnetismPlasma PhysicsIonospheric ElectrodynamicsMagnetohydrodynamicsMaxwell's EquationsPlanetary MagnetospheresAir-earth Current DensityCurrentsIonospheric ConductivityIonospheric Current SystemsIonospheric CurrentsIonospheric Potential DistributionMagnetospheric CurrentsPedersen Conductivity