Day to night shift in reflection height of VLF radio waves derived from IRI model electron density models

IF 0.5 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Studia Geophysica et Geodaetica Pub Date : 2023-11-08 DOI:10.1007/s11200-022-0959-6

Tirumalaraju Madhavilatha, Pyla Peddi Naidu, Malladi Indira Devi

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引用次数: 0

Abstract

The Very Low Frequency (VLF) radio wave propagation characteristics play a very important role in understanding the behaviour of the D-region. The earth-ionosphere wave guide theory has been used to evaluate the reflection height of VLF radio waves using the electron density profiles obtained from the International Reference Ionosphere (IRI) 2012 and 2016 models. For calculating the conductivity parameter, two different collision frequency models have been used. The diurnal shift in reflection height of 16-kHz VLF waves is evaluated for the midpoint of Visakhapatnam-Rugby path using the two IRI models and the results are compared with those values derived from VLF phase measurements made at Visakhapatnam. The theoretically evaluated values using the FT-2001 option for the D-region electron density profile in the IRI-2012 and IRI–2016 models are in good agreement with those obtained from phase measurements, especially in summer. The day to night shift in reflection height obtained using exponential collision critical frequency model are in good agreement with those derived from VLF phase measurements. The diurnal shift in reflection height of VLF radio waves during winter months derived from IRI models are much lower than those obtained from measurements.

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根据 IRI 电子密度模型得出的甚低频无线电波反射高度的昼夜变化

甚低频（VLF）无线电波的传播特性对了解 D 区的行为起着非常重要的作用。利用国际参考电离层（IRI）2012 和 2016 模型获得的电子密度剖面，采用地球电离层波导理论来评估甚低频无线电波的反射高度。在计算电导率参数时，使用了两种不同的碰撞频率模型。使用两个 IRI 模型评估了维萨卡帕特南-鲁格比路径中点的 16 kHz VLF 波反射高度的日移，并将结果与在维萨卡帕特南进行的 VLF 相位测量得出的值进行了比较。在 IRI-2012 和 IRI-2016 模型中，使用 FT-2001 选项对 D 区域电子密度剖面进行的理论评估值与相位测量得出的值非常一致，尤其是在夏季。使用指数碰撞临界频率模型得出的反射高度昼夜变化与甚低频相位测量结果十分吻合。利用 IRI 模型得出的冬季甚低频无线电波反射高度的昼夜变化远低于测量结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Studia Geophysica et Geodaetica 地学-地球化学与地球物理

CiteScore

1.90

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Studia geophysica et geodaetica is an international journal covering all aspects of geophysics, meteorology and climatology, and of geodesy. Published by the Institute of Geophysics of the Academy of Sciences of the Czech Republic, it has a long tradition, being published quarterly since 1956. Studia publishes theoretical and methodological contributions, which are of interest for academia as well as industry. The journal offers fast publication of contributions in regular as well as topical issues.