Characterization of high latitude radio wave propagation over Canada

Characterization of high latitude radio wave propagation over Canada
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加拿大高纬度无线电波传播的特征

DOI:
10.1016/j.jastp.2021.105666
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发表时间:
2021
影响因子:
1.9
通讯作者:
Cameron T
Cameron T
中科院分区:
地球科学4区
文献类型:
--
作者:
Cameron T

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高频电波传播对空间天气引起的电离层扰动非常敏感。传播条件的变化可以用HF发射机/接收机链路直接测量。本文介绍了一个这样的链接,包括一个发射机位于加拿大安大略省的渥太华,和一个定向接收机位于加拿大的警报,NU的数据。发射机按照设定的时间表以5.4和14.4 MHz之间的6个不同频率发射信号,这些信号由接收机检测和处理。基于644天的存档数据,统计分析表征高频无线电波传播条件的过程中的一天和一年。高频传播被发现遵循定期的电离层密度的日变化,调制的季节性趋势。本文提出了一种利用类似于毫米波静日曲线的静日基线来区分空间天气对高频传播的影响的新方法。这种方法可以很容易地分析空间天气对两点之间的高频无线电传播的影响。该方法应用于2016年6月6日发生的极光吸收事件,并用于成功区分极光吸收相关的脱落与电离层日变化相关的脱落。
High frequency (HF) radio wave propagation is sensitive to ionospheric disturbances caused by space weather. Changes in propagation conditions can be directly measured with an HF transmitter/receiver link. This paper presents data from one such link, consisting of a transmitter located in Ottawa, ON, Canada, and a directional receiver located in Alert, NU, Canada. The transmitter emits signals at 6 distinct frequencies between 5.4 and 14.4 MHz on a set schedule that are detected and processed by the receiver. Based on 644 days of archived data, a statistical analysis characterizing HF radio wave propagation conditions over the course of the day and over the year are presented. HF propagation is found to follow the regular diurnal variation in ionospheric density, modulated by seasonal trends. A new method for distinguishing space weather effects from diurnal changes to HF propagation is presented, which utilizes quiet day baselines, similar to riometer quiet day curves. This method allows for easy analysis of the impacts of space weather on HF radio propagation between two points. This method is applied to an auroral absorption event that occurred on 06 June 2016, and is used to successfully distinguish auroral absorption related dropouts from dropouts related to daily ionospheric variation.
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