Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31a0743z&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM31A-0743
Physics
2407 Auroral Ionosphere (2704), 2704 Auroral Phenomena (2407), 2708 Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms
Scientific paper
A systematic model study of magnetic disturbances associated with substorms has been conducted by using a global time-dependent M-I coupling model of substorms and a global current-magnetic disturbance conversion model in which the UT effect and the influence of ground induction currents are included. The unique strengths of this study are the use of Alfven wave approach in the M-I coupling substorm model and the high spatial and temporal resolutions, which not only guaranteed the full self-consistency of the electrodynamics of substorms in the ionosphere, but also enabled us to produce the first-time magnetic disturbances associated with small-scale structured auroral currents. In this presentation, we will show the temporal and spatial features of the modeled magnetoc disturbances associated with the structured substorm currents and the magnetic effects associated with individual current components. We will also quantitatively show whether and where the magnetic effects of the induction currents are important. We will demonstrate the relationship between the substorm current systems and their ground magnetic effects and discuss whether the mid-latitude substorm-time magnetic disturbance is directly caused by the auroral current system. Finally, we will assess the capability and limitation of the present-day ground magnetic data for defining the small-scale current structures around the substorm onset and suggest the optimum latitudinal and longitudinal distributions of ground stations for the study of the substorm onset.
Liang Jian-Jie
Schunk Robert W.
Sojka Jan J.
Zhu Lijun
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