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首页> 外文学位 >Improved modeling of midlatitude D-region ionospheric absorption of high frequency radio signals during solar X-ray flares.
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Improved modeling of midlatitude D-region ionospheric absorption of high frequency radio signals during solar X-ray flares.

机译：太阳X射线耀斑期间中纬度D区电离层对高频无线电信号吸收的改进模型。

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摘要

High frequency (HF) radio communication is widely used for real-time, medium to long range communications due to its low cost of operation and maintenance. However, HF communication is strongly dependent on the state of the ionosphere, which is sensitive to solar X-ray flares. The lowest region of the ionosphere, the D-region, is the region in which the majority of the absorption of HF radio wave energy occurs. D-region HF absorption depends on the local electron density, which is enhanced during a solar X-ray flare. HF propagation data obtained during the HF Investigation of D-region Ionospheric Variation Experiment (HIDIVE) and obtained at the Canadian Space Agency NORSTAR riometer in Pinawa, Manitoba, Canada and X-ray flux data, as reported by GOES satellites, are analyzed here for the purpose of validating and improving the performance of two HF absorption models, the operational Space Weather Prediction Center (SWPC) D-region Absorption model and the physical AbbyNormal model. The SWPC D-region absorption model is an empirical model providing real-time global predictions of D-region absorption, and the physical Absorption by the D and E Region of HF Signals with Normal Incidence (AbbyNormal) model is based on simple D-region chemistry and provides near real-time predictions of midlatitude D-region HF absorption. Analysis of the HIDIVE data revealed an absorption dependence on signal frequency of f-1.24 where f is signal frequency, and a Cos 0.9(chi) dependence on solar zenith angle, chi. These relations differ from what is used in the SWPC model, and from these relations, a new empirical model, the Empirical HIDIVE Absorption (EHA) model, is developed. The EHA model can be used to improve the SWPC model performance. NO density data obtained with the Student Nitric Oxide Explorer (SNOE) and during the Halogen Occultation Experiment (HALOE) are used to improve the method by which the AbbyNormal model defines the nitric oxide (NO) profile within the atmosphere. Improved NO profiles allows for better AbbyNormal characterization of the ionosphere and HF propagation and for better prediction of solar flare-induced HF absorption. This research is sponsored by the Air Force Office of Scientific Research and the Air Force Weather Agency.
机译：高频（HF）无线电通信因其较低的运行和维护成本而被广泛用于实时，中到远程通信。但是，HF通信在很大程度上取决于对太阳X射线耀斑敏感的电离层状态。电离层的最低区域D区域是发生大部分HF无线电波能量吸收的区域。 D区域的HF吸收取决于局部电子密度，该密度在太阳X射线耀斑中会增强。在这里分析了在D区域电离层变化实验（HIDIVE）的HF调查期间获得的，并在加拿大马尼托巴省Pinawa的加拿大航天局NORSTAR riometer上获得的HF传播数据以及GOES卫星报告的X射线通量数据，以用于目的是验证和改善两个HF吸收模型，运行空间气象预报中心（SWPC）D区域吸收模型和物理AbbyNormal模型的性能。 SWPC D区域吸收模型是一种经验模型，可提供D区域吸收的实时全局预测，并且具有正入射的HF信号的D和E区域的物理吸收（AbbyNormal）模型基于简单的D区域化学，并提供中纬度D区HF吸收的近实时预测。对HIDIVE数据的分析显示，吸收率对信号频率f-1.24的依赖性，其中f是信号频率，而Cos 0.9（chi）对太阳天顶角chi的依赖性。这些关系与SWPC模型中使用的关系不同，并且从这些关系中，开发了一个新的经验模型，即经验隐性吸收（EHA）模型。 EHA模型可用于改善SWPC模型的性能。通过学生一氧化氮探测器（SNOE）和在卤素掩星实验（HALOE）期间获得的NO密度数据可用于改进AbbyNormal模型定义大气中一氧化氮（NO）曲线的方法。改进的NO分布图可以更好地表征电离层和HF的AbbyNormal特性，并可以更好地预测太阳耀斑引起的HF吸收。这项研究是由美国空军科研办公室和美国空军气象局赞助的。

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  • 作者

    Schumer, Evelyn A.;

  • 作者单位

    Air Force Institute of Technology.;

  • 授予单位 Air Force Institute of Technology.;
  • 学科 Atmospheric Sciences.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 253 p.
  • 总页数 253
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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