Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72a0592m&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM72A-0592
Other
2744 Magnetotail, 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
The magnetic field in the magnetotail simulated by the LFM global MHD code is compared with a long time series of lobe field data from observations by Geotail and Interball spacecraft. Earlier comparisons of code results with satellite data have been mainly case studies. The comparison of the data from the code with satellite data on large datasets are used to study in more detail the ability of the code to model magnetospheric dynamics. In a study using large database, several intervals of Bargatze et al [1985] data set were simulated using the global MHD code and the AL index computed from the simulation data compared with the actual data. However, ionospheric indices are not very well defined in the code and the magnetic field in the tail under different solar wind conditions is better suited for detailed study. An important issue is the question of how well the code reproduces the directly driven and and loading-unloading components. The latter consists of non-linear or even stochastic parts of the magnetospheric dynamics and play a crucial role in the predictability of the magnetosphere. Previous studies of AL index suggest that the directly driven component is reproduced very well while the loading-unloading effects are not reproduced to the same degree. The comparison of the lobe field from the simulation with data shows agreement with this suggestion. For example, the changes in the lobe field in response to variations in the solar wind dynamic pressure are reproduced well. On the other hand, the agreement is not as good during periods with nearly steady solar wind.
Goodrich Charles Carson
Lyon John G.
Merkine V.
Papadopoulos Konstantinos
Sharma Surjalal A.
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