Computer Science – Numerical Analysis
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa44a..05z&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA44A-05
Computer Science
Numerical Analysis
2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling, 2778 Ring Current
Scientific paper
Subauroral polarization streams (SAPS), are usually associated with geomagnetically disturbed times and considered as a manifestation of magnetosphere and ionosphere (M-I) coupling. Previous research results using radar and satellite measurements have revealed many features of the SAPS events. However, the generation mechanism of SAPS is not without dispute. In this paper, we focus on the effects of subauroral trough conductance on the attributes of SAPS and the evolution of the coupled magnetosphere and ionosphere system through the comprehensive ring current model (CRCM), which includes the coupled electrodynamics of the inner magnetosphere and ionosphere with a self-consistent description of the electric field. Our numerical analysis indicates that low conductance at the subauroral latitudes (due to mid-latitude trough) is critical to the large amplitude of SAPS. The model results are generally in good agreement with common characteristics of SAPS and provide some insights into one possible generation mechanism from a coupled system perspective.
C:son Brandt Pontus
Fok M.-
Lui A. T.
Zheng Yuanlin
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