Observations and Modeling of Scintillation in the Vicinity of a Polar Cap Patch
Observations and Modeling of Scintillation in the Vicinity of a Polar Cap Patch
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DOI：
10.1051/swsc/2022023
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发表时间：
2022-06
影响因子：
3.3
通讯作者：
Leslie J Lamarche;Kshitija B Deshpande;Matthew D Zettergren
中科院分区：
文献类型：
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作者：
Leslie J Lamarche;Kshitija B Deshpande;Matthew D Zettergren
小规模的电离层等离子体结构会在通过电离层的无线电信号中引起闪烁。闪烁信号与等离子体结构发展之间的关系是复杂的。我们用离子中性相互作用的地球空间环境模型（GEMINI）模拟了Resolute湾非相干散射雷达（RISR）观测到的理想极帽斑块内和周围的小尺度等离子体结构的发展。然后，我们用卫星-信标电离层-闪烁全球高层大气模式（SIGMA）模拟信号通过所得到的小尺度结构，以预测地面接收机在不稳定发展的不同阶段将观测到的闪烁特征。最后，我们将预测的信号特征与Resolute湾附近地面接收机的实际闪烁观测结果进行了比较。我们根据电离层中小尺度等离子体结构的性质以及它如何影响不同频率的信号来解释结果，并试图推断电离层等离子体不规则谱的信息。
Small-scale ionospheric plasma structures can cause scintillation in radio signals passing through the ionosphere. The relationship between the scintillated signal and how plasma structuring develops is complex. We model the development of small-scale plasma structuring in and around an idealized polar cap patch observed by the Resolute Bay Incoherent Scatter Radars (RISR) with the Geospace Environment Model for Ion-Neutral Interactions (GEMINI). Then, we simulate a signal passing through the resulting small-scale structuring with the Satellite-beacon Ionospheric-scintillation Global Model of the upper Atmosphere (SIGMA) to predict the scintillation characteristics that will be observed by a ground receiver at different stages of instability development. Finally, we compare the predicted signal characteristics with actual observations of scintillation from ground receivers in the vicinity of Resolute Bay. We interpret the results in terms of the nature of the small-scale plasma structuring in the ionosphere and how it impacts signals of different frequencies, and attempt to infer information about the ionospheric plasma irregularity spectrum.