Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51a1629z&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM51A-1629
Physics
2700 Magnetospheric Physics (6939), 2722 Forecasting (7924, 7964), 2724 Magnetopause And Boundary Layers, 2731 Magnetosphere: Outer, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Considering the asymmetries of the global structure of the magnetopause and indentations nearby the cusps, a new three asymmetric global model of the magnetopause is presented in this talk. Based on 1249 global magnetopause crossings from Geotail, IMP8, Interball, TC1, THEMIS, Wind, Cluster, Polar, LANL and GOES, and corresponding upstream solar wind conditions from ACE or WIND with 5-minutes, this new model is parameterized by solar wind dynamic pressure and magnetic pressure, interplanetary magnetic field (IMF) BZ, and Earth's dipole tilt. These control parameters are selected on the basis of the decrease of the standard deviation by nonlinear multi-parameter fitting over different regions: the subsolar region, low-latitude region, middle-high-latitude region, region for the asymmetries fitting, region for the indentations fitting, and the global region. It is demonstrated that this model can be used to quantitatively study how DP+BP compresses the magnetopause, how IMF BZ erodes the magnetopause, how large the asymmetries of the magnetopause are, and how the Earth's dipole tilt influences the indentations and the asymmetries of the global magnetopause. In addition, the extrapolation for the distant tail magnetopause and for the extreme solar wind conditions is also considered for modeling magnetopause size and shape. Comparison with previous models implies that the standard deviation and the absolute deviation of the new model are obviously decreased. It is shown that this new model is not only appropriate to predict the magnetopause size and shape for the various solar wind conditions, but also can provide a reasonable estimation of the distant tail magnetopause shape.
Gong Jingyu
Lin Runliang
Liu Shujuan
Wang Yadong
Zhang Xinyu
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