Ionosphere Conductance Impacts on the Inner Magnetosphere

Details Ionosphere Conductance Impacts on the Inner Magnetosphere Ionosphere Conductance Impacts on the Inner Magnetosphere

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm22b..03r&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM22B-03

Physics

2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling

Scientific paper

Ionospheric conductances play a central role in the distribution of electric fields, horizontal currents and drift patterns driven by the magnetosphere-ionosphere coupling through field-aligned currents (FAC) from the inner magnetosphere. In this study we investigate the impact on an MHD model of the magnetosphere of varying conductance models in an ionospheric potential solver. A statistical model derived from Dynamics Explorer 1 (DE-1) data is used as a basis for the FAC-conductance relation for Hall and Pedersen conductances. The FAC-conductance relation is also determined by the MHD model's spatial resolution near the Earth which limits the amplitude reached by the FAC and increases the width of current gradients compared to observations. This problem can be addressed by generating an empirical relation between spatially averaged currents and conductivities derived from the measurements. This FAC-conductance relation thus compensates for the lack of localized current densities from the MHD model. The impact of that FAC-conductance relation is investigated both in steady-state snapshots and in dynamic (time-dependent) simulations. Of particular interest are the feedbacks on the current system and the energy transfer between magnetosphere and ionosphere with impacts of modeled drift flow patterns in the ionosphere. These results pertain to science-based model validation efforts.

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