Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72c..03p&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM72C-03
Physics
2407 Auroral Ionosphere (2704), 2724 Magnetopause, Cusp, And Boundary Layers, 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
We investigate both energy transfer and dissipation in a global MHD simulation. We have simulated a major magnetospheric storm that occurred on April 6, 2000, during which the Dst index reached almost -300 nT. For the energy transfer calculation, we first identify the magnetopause surface from the simulation results, after which we calculate the total energy flux incident to the surface. With this method we identify the locations on the magnetopause surface, where the energy transfer takes place and investigate the energy transfer location dependence on the solar wind parameters as well as the dependence of the total transferred energy on the empirical epsilon parameter. Furthermore, we calculate the Joule heating power and the precipitation power in the ionosphere, and determine the locations where the most significant ionospheric dissipation takes place. We find that during the main phase the energy is transferred in the plane of the IMF clock angle, and is dissipated mainly in the dayside ionosphere. Furthermore, we develop a relationship between the ionospheric dissipation power and solar wind parameters using similarity scaling laws. We discuss the implications of the found high correlation results both on magnetospheric dynamics and MHD simulation representation of the dynamics.
Janhunen Pekka
Palmroth M. M.
Pulkkinen Tuija I.
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