Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm32a14l&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM32A-14
Physics
2700 Magnetospheric Physics, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling
Scientific paper
We present results from a code that uses an iterative method to solve for global magnetospheric force equilibria. A three dimensional nonuniform rectilinear grid is used along with initial conditions supplied by empirical magnetic field and pressure models. In general, \( \overrightarrow{J}\times\overrightarrow{B} \neq \nabla p \) initially. By solving MHD equations which are modified to include a frictional dissipation term, the code approaches a state in which \( \overrightarrow{J}\times\overrightarrow{B} = \nabla p \). At this point, the system has reached a force equilibrium. We will present results that use different initial magnetic field and pressure models. For example, the Tsyganenko (89) magnetic field model (with different values of the Kp index of magnetic activity) will be used as an initial condition. We can use a large value for the adiabatic exponent γ , which makes the system nearly incompressible. This helps ensure that the final magnetic field is fairly close to its initial configuration. In this way, we are able to determine a magnetospheric pressure model for various magnetic field configurations.
Birn Joachim
Hesse Matthias
Lemon C. L.
Toffoletto Frank
Wolf Robert
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