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TitleEvaluation of the effect of sporadic-E on high frequency radio wave propagation in the Arctic
AuthorCameron, T GORCID logo; Fiori, R A DORCID logo; Themens, D RORCID logo; Warrington, E MORCID logo; Thayaparan, TORCID logo; Galeschuk, D
SourceJournal of Atmospheric and Solar-Terrestrial Physics vol. 228, 105826, 2022 p. 1-15, Open
Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20210241
Mediapaper; digital; on-line
File formatpdf; html
ProvinceNunavut; Northwest Territories
NTS15; 16; 25; 26; 27; 28; 29; 35; 36; 37; 38; 39; 45; 46; 47; 48; 49; 55; 56; 57; 58; 59; 65; 66; 67; 68; 69; 76; 77; 78; 79; 87; 88; 89; 97; 98; 99; 107; 120; 340; 560
AreaEureka; Sachs Harbour; Resolute; Pond Inlet; Cambridge Bay; Hall Beach; Qikiqtarjuaq; Iqaluit; Rankin Inlet; Qaanaaq; Canada; Greenland; Denmark
Lat/Long WENS-130.0000 -62.0000 84.0000 62.0000
Subjectsgeophysics; Science and Technology; Nature and Environment; Information and Communications; geomagnetism; geomagnetic fields; geomagnetic variations; magnetic storms; ionosphere; ionospheric currents; latitude; modelling; radar methods; models; in-field instrumentation; magnetic field; Canadian High Arctic Ionospheric Network (CHAIN); Canadian Advanced Digital Ionosonde (CADI); Radar; Arctic; monitoring; Methodology; Networks
Illustrationsgeoscientific sketch maps; plots; profiles; time series; models
ProgramPublic Safety Geoscience Assessing space weather hazards
Released2022 01 13
AbstractHigh Frequency (HF) radio propagation, and applications such as Over-The-Horizon Radar (OTHR), is sensitive to ionospheric disturbances caused by space weather. Improved ionospheric modelling and monitoring techniques for the high-latitude and polar regions supports high quality OTHR long-range surveillance. One such ionospheric disturbance is Sporadic-E, a phenomenon in which a thin enhancement in E-region (approximately 90-150 km altitude) electron density acts as a strong reflector of HF radio waves. In this study, we perform a case study of the effect a sporadic-E layer has on HF radio propagation for a layer that was detected over Eureka on July 11, 2012. We study this event using HF radio receiver measurements for a path intersecting the layer, simultaneous ionosonde measurements of the layer, and a series of ray traces through a model ionosphere containing a model of the sporadic-E layer. Utilizing these measurements and simulations, we show how sporadic-E can aid HF radio propagation in some cases, and show that a simple Gaussian sporadic-E model can replicate real HF radio measurements. We also comment on how sporadic-E could affect OTHR operation.
Summary(Plain Language Summary, not published)
Space weather refers to the dynamic conditions on the Sun and in the space environment, in particular, in the near-Earth environment, that can affect critical infrastructure. NRCan operates the Canadian Space Weather Forecast Centre and conducts research into space weather effects on power systems, pipelines, radio communications and GNSS positioning to help Canadian industry understand and mitigate the effects of space weather. This paper examines how daily trends in the upper atmosphere can cause high frequency radio waves to arrive at radio receivers via non-straight line paths. This phenomenon is investigated using radio wave simulations, models of the upper atmosphere, and data from a network of radio transmitters and receivers.

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