Abstract
We review recently developed methods to investigate energy circulation in the near-Earth space using a global magnetohydrodynamic (MHD) simulation GUMICS-4. We describe methods to evaluate the magnetopause energy transfer and ways to quantify effects of the reconnection dynamics. We also present evidence, supported by Cluster spacecraft observations, showing that the interplanetary magnetic field (IMF) y component controls the spatial variation of the magnetopause energy transfer. The simulation results also suggests that the energy transfer exhibits a “hysteresis” effect where the energy transfer does not decrease immediately after the driving conditions start to become weaker. We investigate the hysteresis effect in the simulation and conclude that the previous driving conditions as well as the present state of the global magnetosphere may influence the processes at the magnetopause, and thus regulate the energy input to the system.
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Acknowledgments
The research leading to these results has received funding from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007-2013)/ERC Starting Grant agreement number 200141-QuESpace. The work of MP and TL is supported by the Academy of Finland.
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Palmroth, M. et al. (2011). Quantifying Energy Transfer at the Magnetopause. In: Liu, W., Fujimoto, M. (eds) The Dynamic Magnetosphere. IAGA Special Sopron Book Series, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0501-2_2
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DOI: https://doi.org/10.1007/978-94-007-0501-2_2
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