Role of field-aligned current closure via the Pedersen, Hall, and atmospheric displacement current in the formation of ionospheric current system

Details Role of field-aligned current closure via the Pedersen, Hall, and atmospheric displacement current in the formation of ionospheric current system Role of field-aligned current closure via the Pedersen, Hall, and atmospheric displacement current in the formation of ionospheric current system

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0492y&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0492

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2149 Mhd Waves And Turbulence, 2409 Current Systems (2708), 2427 Ionosphere/Atmosphere Interactions (0335), 2736 Magnetosphere/Ionosphere Interactions, 3210 Modeling

Scientific paper

To consider the transmission process of electromagnetic disturbances carried by field-aligned current (FAC) into the ionospheric and atmospheric loading region, we construct a simplified model for the ionosphere-atmosphere-Earth electromagnetically coupled system. The ionospheric slab (conductor) separated by Earth_fs ground plane by the atmospheric region forms a capacitor. Outgoing current flows in the ionospheric slab and return current flows in the ground plane, forming an inductor. Thus, the ionospheric slab acts as if it has a capacitor in parallel to a ground inductor in series. Electric energy is stored in the dielectric atmospheric region due to the electric field between ionospheric slab and ground plane. Charge present in the ionospheric slab and induced in the ground plane creates a shunt self-capacitance. Magnetic energy associated to currents is stored in the ionospheric slab. The magnetic field links the loop formed by the conductor and ground plane and creates a series self-inductance. This model clarifies the roles of the FAC closure via the currents in the ionosphere-atmosphere-Earth electromagnetically coupled system. Electromagnetic energy associated with FACs is dissipated in the ionosphere through Joule dissipation of the ionospheric divergent Pedersen current carried by ions. On the other hand, the FAC closure via the divergent Hall current carried by electrons increases the energy of the rotational Hall current, causing it to radiate Poynting fluxes that lead to the growth of a poloidal-type magnetic field in the magnetosphere and atmosphere. Furthermore, the FAC closure via the atmospheric displacement current provides Poynting fluxes for the generation of a non-local ionospheric current system. In this study, we will show the physical details of the redistribution process of the FAC_fs momentum and energy into current in the ionosphere-atmosphere loading region.

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