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《中国科学:地球科学(英文版)》 2013-11
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GPU-accelerated computing of three-dimensional solar wind background

FENG XueShang;ZHONG DingKun;XIANG ChangQing;ZHANG Yao;SIGMA Weather Group,State Key Laboratory for Space Weather, Center for Space Science and Applied Research,Chinese Academy of Sciences;  
High-performance computational models are required to make the real-time or faster than real-time numerical prediction of adverse space weather events and their influence on the geospace environment. The main objective in this article is to explore the application of programmable graphic processing units(GPUs) to the numerical space weather modeling for the study of solar wind background that is a crucial part in the numerical space weather modeling. GPU programming is realized for our Solar-Interplanetary-CESE MHD model(SIP-CESE MHD model) by numerically studying the solar corona/interplanetary solar wind. The global solar wind structures are obtained by the established GPU model with the magnetic field synoptic data as input. Meanwhile, the time-dependent solar surface boundary conditions derived from the method of characteristics and the mass flux limit are incorporated to couple the observation and the three-dimensional(3D) MHD model. The simulated evolution of the global structures for two Carrington rotations 2058 and 2062 is compared with solar observations and solar wind measurements from spacecraft near the Earth. The MHD model is also validated by comparison with the standard potential field source surface(PFSS) model. Comparisons show that the MHD results are in good overall agreement with coronal and interplanetary structures, including the size and distribution of coronal holes, the position and shape of the streamer belts, and the transition of the solar wind speeds and magnetic field polarities.
【Fund】: supported by the National Natural Science Foundation of China(Grant Nos.41031066 41231068 41274192 41074121&41074122);; the National Basic Research Program of China(Grant No.2012CB825601);; the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KZZD-EW-01-4);; the Specialized Research Fund for State Key Laboratories
【CateGory Index】: TP391.41;P353.8
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