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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Imaging the topside ionosphere and plasmasphere with ionospheric tomography using COSMIC GPS TEC
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Imaging the topside ionosphere and plasmasphere with ionospheric tomography using COSMIC GPS TEC

机译：使用COSMIC GPS TEC用电离层层析成像技术对顶侧电离层和等离子层进行成像

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摘要

GPS-based ionospheric tomography is a well-known technique for imaging the total electron content (TEC) between GPS satellites and receivers. However, as an integral measurement of electron concentration, TEC typically encompasses both the ionosphere and plasmasphere, masking signatures from the topside ionosphere-plasmasphere due to the dominant ionosphere. Imaging these regions requires a technique that isolates TEC in the topside ionosphere-plasmasphere. Multi-Instrument Data Analysis System (MIDAS) employs tomography to image the electron distribution in the ionosphere. Its implementation for regions beyond is yet to be seen due to the different dynamics present above the ionosphere. This paper discusses the extension of MIDAS to image these altitudes using GPS phase-based TEC measurements and follows the work by Spencer and Mitchell (2011). Plasma is constrained to dipole field lines described by Euler potentials, resulting in a distribution symmetrical about the geomagnetic equator. A simulation of an empirical plasmaspheric model by Gallagher et al. (1988) is used to verify the technique by comparing reconstructions of the simulation with the empiricalmodel. The Constellation Observing System forMeteorology, Ionosphere, and Climate (COSMIC) is used as GPS receiver locations. The verification is followed by a validation of the modified MIDAS algorithm, where the regions' TEC is reconstructed from COSMIC GPS phase measurements and qualitatively compared with previous studies using Jason-1 and COSMIC data. Results show that MIDAS can successfully image features/trends of the topside ionosphere-plasmasphere observed in other studies, with deviations in absolute TEC attributed to differences in data set properties and the resolution of the images.
机译：基于GPS的电离层层析成像技术是一项众所周知的技术，用于对GPS卫星和接收器之间的总电子含量（TEC）进行成像。但是，作为电子浓度的整体度量，TEC通常包含电离层和等离子层，由于占主导地位的电离层而掩盖了顶侧电离层-等离子层的特征。对这些区域进行成像需要一种在顶部电离层-等离子层中隔离TEC的技术。多仪器数据分析系统（MIDAS）使用层析成像技术对电离层中的电子分布进行成像。由于电离层上方存在不同的动力学，其在更远区域的实现尚待观察。本文讨论了MIDAS的扩展，以使用基于GPS相位的TEC测量对这些高度进行成像，并遵循Spencer和Mitchell（2011）的工作。等离子体被欧拉电势约束到偶极子场线，从而导致关于地磁赤道对称的分布。 Gallagher等人的经验等离子层模型的仿真。 （1988）通过将模拟的重构与经验模型进行比较来验证该技术。气象，电离层和气候星座观测系统（COSMIC）用作GPS接收器位置。验证之后是对改进的MIDAS算法的验证，其中从COSMIC GPS相位测量重建了该区域的TEC，并与使用Jason-1和COSMIC数据的先前研究进行了定性比较。结果表明，MIDAS可以成功成像其他研究中观测到的顶侧电离层-等离子层的特征/趋势，绝对TEC的偏差归因于数据集属性和图像分辨率的差异。

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