Development of a middle and low latitude theoretical ionospheric model and an observation system data assimilation experiment
Development of a middle and low latitude theoretical ionospheric model and an observation system data assimilation experiment
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中低纬度电离层理论模型建立及观测系统资料同化实验
DOI:
10.1007/s11434-007-0462-z
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发表时间:
2008
期刊:
影响因子:
--
通讯作者:
L. Liu
中科院分区:
文献类型:
--
作者:
W. Wan;T. Yu;X. Yue;H. Le;Y. Chen;L. Liu
On the basis of previous work, we develop a middle and low latitude theoretical ionospheric model in this paper, named Theoretical Ionospheric Model of the Earth in the Institute of Geology and Geophysics, Chinese Academy of Sciences (TIME-IGGCAS). TIME-IGGCAS solves the equations of mass continuity, motion and energy of electron and ions self-consistently and uses an eccentric dipole field approximation to the Earth’s magnetic field. We combine the Eulerian and Lagrangian approaches in the model and take account of the plasma E×B drift velocity. Calculation results reveal that the model is steady and credible and can reproduce most large-scale features of ionosphere. By using TIME-IGGCAS, we carried out an observation system data assimilation experiment. Assimilation results show that the E×B drift velocity can be accurately estimated by ingesting the observed foF2 and hmF2 into the model applying nonlinear least-square fit method. We suggest that this work is of great significance in the development of ionospheric data assimilation model to give better nowcast and forecast of ionosphere.
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