Dynamical property of storm-time subauroral rapid flows as a manifestation of complex structures of the plasma pressure in the inner magnetosphere: Simulation and SuperDARN Hokkaido radar observation

Details Dynamical property of storm-time subauroral rapid flows as a manifestation of complex structures of the plasma pressure in the inner magnetosphere: Simulation and SuperDARN Hokkaido radar observation Dynamical property of storm-time subauroral rapid flows as a manifestation of complex structures of the plasma pressure in the inner magnetosphere: Simulation and SuperDARN Hokkaido radar observation

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13b..06e&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM13B-06

Physics

2411 Electric Fields (2712), 2463 Plasma Convection (2760), 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling, 2778 Ring Current

Scientific paper

During the intense magnetic storm of 15 December 2006, the mid-latitude SuperDARN Hokkaido radar observed a dynamical character of rapid, westward flows (at 50-56 MLAT) which may be referred to as the subauroral polarization stream (SAPS). The simulation that couples the inner magnetosphere and the subauroral ionosphere was performed using a realistic boundary condition of the hot-ion distribution determined from four LANL satellites at 6.6 Re. Temporal changes in the hot-ion distribution were gradually brought by the convection electric field from the plasma sheet to L~2, resulting in a complex structure of the plasma pressure in the inner magnetosphere. Field-aligned currents that were generated by a longitudinal gradient of the plasma pressure resulted in rapid plasma flows in the subauroral ionosphere. The simulated velocity shows good agreement with the radar observation in terms of the temporal and spatial variations of the rapid flows as well as the flow velocity. For example, the simulation result shows that a temporal increase in the hot-ion density in the plasma sheet results in the temporal reduction and subsequent intensification of the rapid flow at certain subauroral latitudes. It is suggested that the subauroral plasma flow is likely a good measure for widely monitoring and deeply understanding the coupling process between the inner magnetosphere (ring current) and the subauroral ionosphere.

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