Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53c..07s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM53C-07
Physics
Plasma Physics
[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7899] Space Plasma Physics / General Or Miscellaneous, [7924] Space Weather / Forecasting
Scientific paper
Recently Toivanen (P.K. Toivanen, JGR 10.1029/2006JA011815, 2007) described a magnetospheric magnetic field model using coordinate transformations to deform the earth's dipole field into a magnetospheric configuration. The deformation of the dipole field is accomplished by five consecutive deformations caused by the ring current, the open and closed field lines, the near earth plasma sheet, dayside compression, the magnetopause and tail lobes, and the dipole tilt. The magnetic field is parameterized by geometrical parameters corresponding to each of these contributions which are consequently used in the coordinate transformations in order to deform the initial dipole field. Here we use the WINDMI model to drive the Toivanen analytical model of the magnetospheric magnetic field. We develop a new combined model that uses the physical variables and parameters of the Toivanen model to produce a time dependent magnetospheric configuration that will dynamically evolve corresponding to solar wind activity. We present derivation of geometric parameters from the plasma physics variables in the WINDMI model that will be used as input into the Toivanen magnetic field model. We accomplish this by analytically estimating the geometric factors needed to drive the magnetic field model from the energy stored in the ring current, the field aligned current values, the geotail current values, the plasma sheet force balance, the magnetopause current values, and the dayside solar wind interaction with the magnetosphere arising from the solar wind dynamic and magnetic pressure. The new model is used to track the magnetospheric field configuration during large geomagnetic storm events.
Horton Wendell
Mays Leila M.
Patra Sudhanwa
Spencer E. A.
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