SH003-0007
Quantitative Investigation of the Effect on Ground Magnetic Perturbations of IMF Bx

Monday, 7 December 2020
Poster
Norah Kaggwa Kwagala1, Therese Moretto1, Michael Hesse1, Paul Tenfjord1, Cecilia Norgren1, Gabor Toth2, Tamas I Gombosi2, Hakon Kolsto1 and Susanne Flø Spinnangr1, (1)University of Bergen, Space Plasma Physics Group, Bergen, Norway, (2)University of Michigan, Department of Climate and Space, Center for Space Environment Modeling, Ann Arbor, MI, United States
Abstract:
In this work, we investigate quantitatively the effect of IMF Bx on magnetospheric dynamics, ionospheric currents, and the resulting magnetic perturbations measured at magnetometer stations on the ground. Using the University of Michigan’s space weather modeling framework (SWMF), two historic geomagnetic storms are simulated and compared to ground-based magnetic observations. For each storm two separate simulations are carried out, one with IMF Bx artificially set to zero throughout the event and the other keeping the measured variable IMF Bx in the driving conditions. The difference between the outputs from the two runs in the magnetosphere, ionosphere and magnetic perturbations on the ground will be presented and discussed.
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