日冕物质抛射的偏振射电探测观测建模
Modeling Polarized Radio Sounding Observations of a Coronal Mass Ejection
AI总结：
本文利用FETCH仪器概念和AWSoM模拟，评估了法拉第旋转和总电子含量射电观测在测量日冕物质抛射演化结构和速度方面的准确性，发现法拉第旋转对结构更敏感。
摘要：
日冕物质抛射（CMEs）在从太阳传播到地球的过程中演化显著，因此对其速度、磁场强度、密度和整体结构变化的遥感观测对于预测其到达时间和地磁有效性至关重要。结合法拉第旋转和总电子含量的射电视线观测与白光观测，通过仔细分析可以测量这些属性。本文描述了这些分析技术，并评估了它们在测量CME复杂演化结构和速度方面的准确性。该方法利用了日冕和日球层结构法拉第效应追踪器（FETCH）的布局，这是一种纯太空仪器概念，并以Alfven波太阳大气模型（AWSoM）模拟作为输入来评估这些基于射电的测量。聚焦于密度和速度，我们发现对CME属性的原位测量观测到了独特CME结构中相似但不同的方面。AWSoM模型表明，法拉第旋转可能比总电子含量（TEC）对结构更敏感。最后，我们讨论了模拟在确定磁通量绳后缘位置时揭示的困难。
英文摘要：
Coronal Mass Ejections (CMEs) evolve significantly as they propagate from the Sun to the Earth, so remote observations of their changes in speed, strength of the magnetic field, density, and overall structure are critical for predicting their arrival time and geoeffectiveness. Radio line-of-sight observations of Faraday rotation and Total Electron Content combined with white-light observations enables the measurement of these properties with careful analyses. This paper describes the analysis techniques and evaluates their accuracy with regard to measuring a CME's complex evolving structure and speed. The approach utilizes the layout of the Faraday effect tracker of coronal and heliospheric structures (FETCH), a purely space-based instrument concept, with Alfven Wave Solar atmosphere Model (AWSoM) simulations as input for evaluating these radio-based measures. Focusing on density and velocity/speed, we find that in-situ measurements of CME properties observe similar but different aspects of the distinct CME structure. The AWSoM model suggests that Faraday rotation may be a more sensitive measure of structure than Total Electron Content (TEC). Finally, we discuss the difficulty the simulation reveals in determining the trailing edge location of a magnetic flux rope.
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