Evaluation of the effect of sporadic-E on high frequency radio wave propagation in the Arctic
High 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.
This project was supported by TPA 02-2020 between the DRDC and NRC an under MoU 2018070005 between the DND and NRCan. The Leicester authors are grateful to the EPSRC for their support of the development of the modelling through grants EP/K008781/1, EP/ C014642/1 and GR/N66056/01.
CitationJournal of Atmospheric and Solar-Terrestrial Physics 228 (2022) 105826
Author affiliationSchool of Engineering
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