Physics – Plasma Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm32b..07h&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM32B-07
Physics
Plasma Physics
2736 Magnetosphere/Ionosphere Interactions, 2744 Magnetotail, 2788 Storms And Substorms
Scientific paper
A new high-dimensional Solar Wind Driven Magnetosphere-Ionosphere model called WINDMI.SR has been constructed to address the issue of the propagation of compressional Alfven pulses and mini-shocks up and down the magnetotail. The Tsyganenko-96 model is used to calculate a large inductance matrix that describes, along with the local central plasma sheet polarization capacitance vector, the solar wind driven interactions in the geotail and their coupling through field aligned nightside current loops to the auroral and polar cap ionosphere. The diagonalization of the large, symmetric inductance matrix gives the eigen modes of the system ranging from the global one hour mode of the Global WINDMI model to one minute modes. For large substorm energy releases the compressional pulse fronts steepen forming mini-shocks. For a midtail unloading event an N-shaped pulse travels both Earthward and tailward. The Earthward traveling pulse is partially reflected and partially transmitted to the dissipative ionosphere. The communciation between the two substorm onset regions --auroral field lines and the midtail NENL region-- are studied in some detail in the new model. When supplemented with an external northward turning trigger, this substorm model can successfully compete with neural networks in reproducing the essential features of the standard substorm databases. The model is based on plasma physics equations and has properties such as charge and energy conservation and causality intrinsic to the physical laws. This work was supported in part by the National Science Foundation Grant ATM-9907637.
Crabtree Chris
Doxas Isidoros
Horton Wendell
Weigel Robert S.
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