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Study of equatorial ionospheric irregularities using space tethered, multipoint technique and coordinated ground-based FPI and scintillation measurements.

机译：利用空间束缚，多点技术以及基于地面的FPI和闪烁测量结果对赤道电离层不规则现象进行研究。

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摘要

Technological advances are exploiting the Earth's ionosphere for the purpose of communication and navigation spurring a need to understand the ionospheric irregularities which can have adverse effects on these signals. This dissertation studies equatorial spread F (ESF) irregularities using two different measurement techniques, namely, space-based simultaneous, multi-point measurements and ground-based Fabry-Perot Interferometric (FPI) and scintillation measurements.; The TSS-1R mission (1996) provided a novel technique for probing the ionosphere using multiple space tethered sensors to simultaneously sample the ionosphere in the horizontal and vertical scales. Studies using data from this mission indicate that ESF irregularities can have very complex structures with sharp gradients and structuring over vertical scale lengths of the order of 10 km, at 300 km altitude. Large eastward tilt of 55° over this altitudinal scale was observed. Thus, the study has not only provided the first ever simultaneous, in situ, multi-point measurements of ESF morphology, but has also demonstrated the feasibility and potential of using space tethered sensors, flying in formation, to explore irregularities in a two dimensional space scale.; Low-latitude, coordinated studies using FPI neutral wind data and ionospheric scintillation measurements from Chile between July–October, 1997, examined the extent of plasma-neutral coupling in the nighttime ionosphere. A correlation between zonal wind characteristics and the occurrence/intensity of spread F was observed. A modest dependence was seen between the meridional winds and spread F. A very high degree of coupling existed between the monthly-averaged zonal winds and irregularity drifts, especially after 2100 LT, suggesting that the F region polarization electric fields are well developed. This provided experimental confirmation of the role of the F region dynamo as the primary driver of the nighttime electrodynamics. Comparison of this study with data from two near-magnetic equatorial sites in Peru showed the existence of latitudinal coherence in plasma-neutral coupling. Thus, the localized winds can exert a strong control over the field-aligned irregularity drifts over at least 7°. The wind and scintillation drift velocities were seen to be higher in Peru, as expected. Simple modeling studies for the Chilean site have been performed for comparison with the experimental results.
机译：为了通信和导航的目的，技术的进步正在利用地球的电离层，这促使人们需要了解可能对这些信号产生不利影响的电离层不规则性。本文利用两种不同的测量技术研究了赤道​​扩散F（ESF）的不规则性，即空基同时多点测量和地面法布里-珀罗干涉法（FPI）和闪烁测量。 TSS-1R任务（1996）提供了一种新颖的技术，可以使用多个空间系留传感器探测电离层，同时在水平和垂直尺度上对电离层进行采样。使用此任务的数据进行的研究表明，ESF不规则结构可能具有非常复杂的结构，具有陡峭的梯度，并且在300 km高度的10 km量级的垂直标度长度上具有结构性。在这个高度范围内观察到大的向东倾斜55°。因此，该研究不仅提供了有史以来首次对ESF形态进行同时的原位多点测量，而且还证明了使用空间系留传感器进行编队飞行的可行性和潜力。探索二维空间尺度上的不规则性。使用FPI中性风数据和智利在1997年7月至10月之间的电离层闪烁测量进行的低纬度协调研究，研究了夜间电离层中等离子体与中性耦合的程度。观察到纬向风特征与扩展F的发生/强度之间的相关性。在子午风和扩展F之间存在适度的依赖性。月平均纬向风和不规则漂移之间存在很高的耦合度，尤其是在2100 LT之后，这表明F区极化电场发展良好。这提供了F区域发电机作为夜间电动动力的主要驱动力的作用的实验证实。这项研究与秘鲁两个近磁赤道站点的数据比较表明，在等离子体-中性耦合中存在纬度相干。因此，局部风可以对至少7°的场对准不规则漂移施加强有力的控制。如预期的那样，秘鲁的风和闪烁漂移速度更高。为了与实验结果进行比较，对智利站点进行了简单的建模研究。

著录项

  • 作者

    Indiresan, Rohini Sarpeshkar.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Physics Atmospheric Science.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 301 p.
  • 总页数 301
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
  • 关键词

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