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《Chinese Journal of Geophysics》 2019-01
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Time-dependent simulation and result validation of interplanetary solar wind

LI HuiChao;FENG XueShang;XIANG ChangQing;National Space Science Center,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
The ambient solar wind has critical influence on the space environment near the Earth.Three dimensional magnetohydrodynamics solar wind model is an important tool for research and forecast of ambient solar wind.Employing boundary condition driven by solar photospheric magnetic field observation,we develop a time-dependent three dimensional magnetohydrodynamics interplanetary solar wind model.Using this model,we simulate the ambient solar wind of Year 2008,and analyze the evolution of global solar wind structures and the connection between interplanetary in-situ measurements and corona structures during that year.We realize a set of procedures,which evaluate the quality of predictions for both continuous solar wind parameters and characteristic structures of the solar wind.The evaluation results indicate that our model satisfactorily reproduces the large scale structure of the ambient solar wind during Year 2008.The correlation coefficient between observed and simulated speed is higher than 0.6.The strength of simulated interplanetary magnetic field matches observation well.All interplanetary magnetic field reverses and 82.76% of the stream interaction regions are captured by our model.The false alarm rate of the interplanetary magnetic field reverse prediction is only 6.67% whilethat of the stream interaction region is only 11.11%.The errors in predicting the arrival time of these two structures are about 1 day.Through comprehensive analysis of the evaluation result,we also gain understanding of the major issue of model improvement,including the structure of the high speed flow and the distribution of magnetic field at the inner boundary.
【Fund】: 国家自然科学基金(41531073 41231068 41731067 41574171 41504132)资助
【CateGory Index】: P353.8
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Chinese Journal Full-text Database 1 Hits
1 Shi Tsan WU;Murray DRYER;Center for Space Plasma and Aeronomic Research, the University of Alabama in Huntsville;Space Weather Predictions Center, National Weather Service, National Oceanic and Atmospheric Administration;;Comparative analyses of current three-dimensional numerical solar wind models[J];Science China(Earth Sciences);2015-06
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