Substorms in the ionosphere: LFM and GUMICS-4 global MHD simulations compared

Details Substorms in the ionosphere: LFM and GUMICS-4 global MHD simulations compared Substorms in the ionosphere: LFM and GUMICS-4 global MHD simulations compared

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm22a0220p&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM22A-0220

Physics

2400 Ionosphere, 2700 Magnetospheric Physics, 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling, 2788 Storms And Substorms

Scientific paper

We simulate a substorm that occurred on March 28-29, 1998, using two state-of-the-art global MHD simulation codes. The substorm evolution in the ionosphere is investigated in three simulation runs. In the first two runs we use the usual setup of the two codes, in which the ionospheric potential is determined from the field-aligned currents and magnetospheric particle precipitation. In the third run the ionospheric module of the LFM simulation is replaced by the Thermosphere Ionosphere Nested Grid (TING) model. In particular, the global ionospheric energy deposition during the substorm is evaluated by comparing the spatial and temporal variation of Joule heating and particle precipitation in the three simulation runs. Furthermore, the open-closed field line boundary and the polar cap potential are compared in the two codes in order to investigate the global convection structure. The performance of the two codes is further quantified by comparing the simulation results with global measurements (e.g., SuperDARN, DMSP, AMIE). We investigate the details of the ionospheric modules in order to identify the reasons for similarities and differences between the simulation results and their agreement with the global observations. Ultimately, we consider the impact of this comparison on the ionospheric dynamics of the substorm.

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