Ionospheric Conductance From IMF-Dependent Models of Ground Geomagnetic Perturbations, Ionospheric Electric Fields and Field-Aligned Currents

Details Ionospheric Conductance From IMF-Dependent Models of Ground Geomagnetic Perturbations, Ionospheric Electric Fields and Field-Aligned Currents Ionospheric Conductance From IMF-Dependent Models of Ground Geomagnetic Perturbations, Ionospheric Electric Fields and Field-Aligned Currents

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm41c..09p&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM41C-09

Physics

2708 Current Systems (2409), 2712 Electric Fields (2411), 2409 Current Systems (2708), 2411 Electric Fields (2712), 2463 Plasma Convection

Scientific paper

Recent progress in the modeling of ground geomagnetic perturbations {B}, ionospheric electric fields {E} (DMSP, DE-2) and field-aligned current densities j ∥ (\O rsted/Magsat, DE-2) made possible to attempt reconstruction of the ionospheric ``electromagnetic'' conductance by solving self-consistently the following equations: $ ∇ ṡ j perpendicular to = Σ P (∇ ṡ E) + (E ṡ ∇ Σ P ) + ( {∇ Σ H x E} ) ṡ nr = -j ∥ ∇ x j perpendicular to = ∇ Σ P x E + ∇ x ({Σ H E x nr}) = -(1)/(μ 0) (∇ ṡ B) Here j _{\perp} is the ionospheric current; \Sigma _H and \Sigma _P are the height-integrated Hall and Pedersen conductances, not separated into the UV and ``precipitating particle'' components. The developed algorithm is a reverted ``magnetogram inversion technique''. We report details of this algorithm and its validation through the test runs where we first reconstructed ionospheric conductances using the electric fields and field-aligned currents inverted from given distributions of the ground geomagnetic perturbations and model conductances (UV and particles). Then we utilized a series of (now published) IMF-dependent models for B, E, and j allel in reconstructing \Sigma _H and \Sigma _P$ for various orientations of the IMF. The obtained conductance patterns are in agreement with most of the known statistical models for variable geomagnetic activity, as well as with the conductivity distributions used in the KRM and AMIE techniques. We discuss possible implications of that modeling for better understanding the voltage-current relationship in the magnetosphere-ionosphere coupling.

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