On the Use of Space-Environmental Satellite Data for Global Magnetohydrodynamic Simulations

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• 作者：Maibys Sierra Lorenzo ; Margarete Oliveira Domingues…
• 关键词：Global magnetohydrodynamic model ; Continuous wavelet transform ; Data assimilation ; Magnetosphere ; Space electrodynamics
• 刊名：Brazilian Journal of Physics
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：46
• 期：6
• 页码：703-713
• 全文大小：1,989 KB
• 刊物类别：Physics and Astronomy
• 出版者：Springer New York
• ISSN：1678-4448
• 卷排序：46

文摘

A global magnetohydrodynamic (MHD) model describes the solar-terrestrial system and the physical processes that live in it. Information obtained from satellites provides input to MHD model to compose a more realistic initial state for the equations and, therefore, more accurate simulations. However, the use of high resolution in time data can produce numerical instabilities that quickly interrupt the simulations. Moreover, satellite time series may have gaps which could be a problem in this context. In order to contribute to the overcoming of such challenges, we propose in this work a methodology based on a variant of the continuous wavelet transform to introduce environmental satellite data on the global resistive MHD model originally developed by Prof. Ogino at the University of Nagoya. Our methodology uses a simplified time-scale version of the original data that preserves the most important spectral features of the phenomena of interest. Then, we can do a long-term integration using this MHD model without any computational instability, while preserving the main time-scale features of the original data set and even overcome possible occurrence of gaps on the satellite data. This methodology also contributes to keeping more realistic physical results.