Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm51a..08f&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM51A-08
Physics
2704 Auroral Phenomena (2407), 2708 Current Systems (2409), 2788 Storms And Substorms, 2447 Modeling And Forecasting
Scientific paper
A three dimensional current system model has been developed for the nighttime sector during the expansion phase through early recovery phase of bulge-type auroral substorms. This model was derived from height integrated horizontal ionospheric currents calculated from models of the height integrated conductivity and convection electric field models previously published. These models were based on a set of data from the Dynamics Explorer 2 satellite taken and organized on the basis of global auroral images from Dynamics Explorer 1. The model predicts a westward electrojet consisting of a wide post-midnight component and an intense narrow pre-midnight component. These two components are connected across midnight magnetic local time where the post-midnight electrojet contribution to the intense pre-midnight component can account for ~50% of the peak pre-midnight total current. A prominent feature in the model is the prediction of a depletion in the total westward electrojet current around midnight. This midnight dip is investigated using Polar images and carefully selected ground based magnetometers.
Friel M.
Gjerloev Jesper W.
Hoffman Robert A.
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