Dynamic Tomographic Imaging of the Solar Corona
Dynamic Tomographic Imaging of the Solar Corona
复制标题
日冕的动态层析成像
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Yuguo Chen
中科院分区：
文献类型：
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作者：
M. Butala;F. Kamalabadi;R. Frazin;Yuguo Chen
太阳大气中的电子密度和温度的三维(3-D)图可以由各种地面和天基仪器测量的二维图像层析重建。日冕的电子密度和温度是了解促成空间天气的物理机制的基本参数，或在极端情况下可能对地球和近地空间环境产生不利影响的物理现象。需要新的信号处理方法，以充分利用当前一代太阳观测航天器提供的丰富和复杂的观测套件。特别是，本文提供了重建日冕动态三维电子密度和温度结构的信号模型和相应的最优状态估计方法，重点讨论了与太阳层析成像相关的许多挑战。
Three-dimensional (3-D) maps of the electron density and temperature in the solar atmosphere can be tomographically reconstructed from two-dimensional images that are measured by a variety of ground-based and space-based instruments. The electron density and temperature of the solar corona are fundamental parameters for understanding the physical mechanisms that contribute to space weather, or physical phenomena that can, in extreme cases, have adverse effects on Earth and the near-Earth space environment. New signal processing methods are required to take full advantage of the rich and complex suite of observations that are available from the current generation of Sun-observing spacecraft. In particular, this paper provides signal models and corresponding optimal state estimation methods for reconstructing the dynamic 3-D electron density and temperature structures in the solar corona with focus on the many challenges associated with solar tomography.