The Electrodynamics in the Ionosphere During Substorms

Details The Electrodynamics in the Ionosphere During Substorms The Electrodynamics in the Ionosphere During Substorms

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0459a&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0459

Physics

2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2411 Electric Fields (2712), 2455 Particle Precipitation, 2788 Storms And Substorms

Scientific paper

From the observations by the PIXIE and UVI cameras on board the Polar satellite, we derive global maps of the precipitating electron energy spectra from less than 1 keV to 100 keV. Based on the electron spectra, we infer the height profiles of the resulting ionization. Photoionization by solar illumination is also included in these calculations. We then generate instantaneous global maps of the Hall and Pedersen conductances. The UVI camera provides good coverage of the lower electron energies contributing most to the Pedersen conductance, while PIXIE captures the high energetic component of the precipitating electrons affecting the Hall conductance. A study by Aksnes et al. [Ann. Geophysicae, 20, 1181, 2002 ] shows that the Hall to Pedersen conductance ratios from combined PIXIE and UVI measurements are larger than those given by existing statistical conductance models. While most statistical conductance models have derived conductances from electron precipitation data below approximately 30 keV, PIXIE measurements provide us with the electron fluxes at higher energies needed to derive an accurate Hall conductance. The instantaneous global conductance maps derived from combined PIXIE and UVI measurements have been implemented in the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) procedure to provide global instantaneous distributions of ionospheric electrodynamical parameters. In this study, we present the electrodynamics in the ionosphere during substorms. We also investigate the possible effects of the PIXIE data on the AMIE outputs.

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