Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm43a1748n&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM43A-1748
Physics
[2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2760] Magnetospheric Physics / Plasma Convection, [2790] Magnetospheric Physics / Substorms
Scientific paper
The magnetospheric substorm is the fundamental but the unsolved problem in the solar-terrestrial physics. In particular, the generation process of substorm-FAC, the heart of the substorm dynamics, is not fully discussed and understood in the context of the momentum/energy balance in the Magnetosphere-Ionosphere coupling system. Based on the analysis of GOTAIL/MGF, LEP and EPIC data, we have suggested that MHD slow mode is the primary process as a non-Alfvenic (non-convective) motion in the earth’s magnetotail. In the slow mode motion, the plasma fluid inside the flux tube move along the field line without causing any enhancement of total pressure profile. This resolving process of the pressure gradient and magnetic tension along the magnetic field is not included in the framework of the convective or the fast mode motion. So, the slow mode might have a key role in overall configuration change (redistribution of plasma and the reconfiguration of magnetic field) of the near-earth magnetotail. In this study, we refine the data analysis and propose a substorm scenario based on the slow mode interpretation mentioned above. Also we will examine the scenario by comparing data analysis and MHD simulation. The MHD simulation and the analysis of its results are performed on an web-based operation system and an advanced visualization system that are introduced in NICT recently.
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