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TitleCharacterization of high latitude radio wave propagation over Canada
AuthorCameron, T GORCID logo; Fiori, R A DORCID logo; Warrington, E MORCID logo; Stocker, A JORCID logo; Thayaparan, TORCID logo; Danskin, D WORCID logo
SourceJournal of Atmospheric and Solar-Terrestrial Physics vol. 219, 105666, 2021 p. 1-14,
Alt SeriesNatural Resources Canada, Contribution Series 20210020
Mediapaper; on-line; digital
File formatpdf; html
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Canada
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long WENS-170.0000 -30.0000 80.0000 40.0000
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
SubjectsScience and Technology; geophysics; ionosphere; absorption
Illustrationslocation maps; cross-plots; diagrams; charts; tables
ProgramPublic Safety Geoscience Assessing space weather hazards
Released2021 05 03
AbstractHigh 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.
Summary(Plain Language Summary, not published)
High frequency (HF) radio wave propagation is used for communications, surveillance, and research by many organizations around the world because it is able to travel long distances without needing expensive infrastructure. HF radio waves are strongly affected by disturbances caused by space weather. These disturbances can interfere with, or even interrupt HF radio transmissions. In this paper, we present data from an experimental HF radio network designed to study the effects of space weather on HF radio propagation. This network is made up of multiple HF radio transmitters located across northern Canada, that all transmit signals to a receiver located near the north pole. By comparing HF radio data from different times of day and year, we are able to show how HF radio propagation changes during normal conditions. Using this information, we are then able to devise a method of separating space weather related dropouts from non-space weather related dropouts. As an example, we present and analyze one such space weather related dropout using this method.

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