Empirical Models of Equatorial Storm-Time Electric Fields

Details Empirical Models of Equatorial Storm-Time Electric Fields Empirical Models of Equatorial Storm-Time Electric Fields

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa13b..06f&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA13B-06

Physics

[2435] Ionosphere / Ionospheric Disturbances, [2441] Ionosphere / Ionospheric Storms, [2712] Magnetospheric Physics / Electric Fields, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

Storm-time electric fields are responsible for large ionospheric perturbations with a broad range of temporal and spatial scales from high to equatorial latitudes. These electric fields have been extensively studied over five decades using ground- and satellite-based electrodynamic plasma drift and current measurements and also global convection models. However, there are still significant questions on their relationship to interplanetary and magnetospheric processes. This is particularly the case for storm-time prompt penetration electric fields which generate the largest ionospheric disturbances. Over the last decade, several empirical ionospheric electric field models have been developed to describe the storm-time dependence of equatorial ionospheric electric fields on interplanetary electric fields, auroral current strengths, and cross polar cap potential. In this talk, we describe initially some of the experimental difficulties in accurately estimating the equatorial prompt penetration ionospheric electric fields in the presence of significant storm-time driven thermospheric wind and conductivity effects. Then, we examine the results of various storm-time empirical electric field models focusing on the predicted lifetimes of the prompt penetration electrodynamic disturbances and their variability.

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