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本文利用两颗跟飞的GRACE卫星载GPS信标测量数据和基于差分相对TEC的层析算法,实现了全球范围的顶部电离层和等离子体层(450~5000km)层析成像.反演结果表明,利用低轨道卫星载GPS信标测量数据可以有效地重建顶部电离层和等离子体层的全球二维分布图像.对不同地磁活动条件下的天基层析反演结果表明,等离子体层电子密度随纬度的分布是不均匀的;在低纬赤道带,从顶部电离层向上延伸直到等离子体层,以及等离子体层中局地的电离增强云团,经常出现近似垂直于磁力线的电子密度柱状增强结构.
In this paper, tomography of the top ionosphere and plasma layer (450 ~ 5000km) in the world has been achieved by using two satellite-based GPS beacon measurements with GRACE satellite and a tomography algorithm based on differential relative TEC. The inversion results show that , The use of low-orbit satellite-borne GPS beacon measurement data can effectively reconstruct the global two-dimensional distribution images of the top ionosphere and plasma layer.The inversion results of space-based tomosynthesis under different geomagnetic activity conditions show that the electron density of the plasma layer The distribution of latitudes is non-uniform; at low latitudes the equatorial belt extends upward from the top ionosphere up to the plasma layer and locally ionically enhanced clouds in the plasma layer, often with electron-density columnar enhancement structures approximately perpendicular to the magnetic field lines .