Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0464k&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0464
Other
2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
We present quantitative comparisons between a global MHD simulationGUMICS-4 and observations from multiple spacecraft in different regions of the magnetosphere and from ground-based instrument networks. We use a recently developed technique to evaluate the energy entry from the solar wind into the magnetosphere and the amount of energy dissipated in the ionosphere. These are compared with their empirical estimates, the Akasofu epsilon-parameter and the Joule heating and precipitation power deduced from the level of magnetic disturbances. The analysis shows that the overall level of ionospheric energy dissipation is smaller in the simulation than given by the observational proxies, but the temporal changes in the dissipated power are quite similar both for the storm and substorm cases. We also use in-situ magnetic field measurements from the high-altitude magnetosphere to examine the temporal variations in the magnetosphere: Comparison of the simulations with dayside geosynchronous orbit observations during the storm shows that the simulated magnetopause location agrees well with the observed. The nightside magnetic reconfiguration, tail stretching and dipolarization, during the substorm were reproduced in the simulation, although there were some differences in the timing and intensity of the variations. These results are discussed in the context of how reliably the global simulations reproduce observations on one hand during a strongly driven storm event and on the other hand during a substorm more dependent on internal tail dynamics. Finally, we compare the GUMICS-4 results with corresponding results from other simulation codes.
Janhunen Pekka
Kauristie Kirsti
Nagai Takaya
Palmroth M. M.
Pulkkinen Tuija I.
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