Abstract
Sporadic-E (‘Es’) layers in the ionosphere allow communication at much higher frequencies than would be possible via the background ionosphere, especially at solar cycle minimum. Es is created by a different mechanism from the background ionosphere and the creation process and structure are not fully understood. Similarly, the way that radio waves propagate via Es is not well characterised. Because of these factors, and particularly because of its intermittent nature, Es is difficult both to predict and to model. For these reasons Es is either represented very simplistically in ionospheric prediction models or it is not included at all.
This paper describes an experimental investigation of differential fading between orthogonal polarisations of 50 MHz signals propagated via Es at oblique angles, aimed at improving our understanding of the underlying mechanisms. Initial results indicate that cross-polarisation fading is frequently significant on a timescale from seconds to minutes.
This paper describes an experimental investigation of differential fading between orthogonal polarisations of 50 MHz signals propagated via Es at oblique angles, aimed at improving our understanding of the underlying mechanisms. Initial results indicate that cross-polarisation fading is frequently significant on a timescale from seconds to minutes.
Original language | English |
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Number of pages | 9 |
Publication status | Published - 12 Aug 2019 |
Event | Nordic HF conference - Fårö, Sweden Duration: 12 Aug 2019 → 14 Aug 2019 http://www.nordichf.org/index.htm?index2.htm&2 |
Conference
Conference | Nordic HF conference |
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Abbreviated title | HF-19 |
Country/Territory | Sweden |
City | Fårö |
Period | 12/08/19 → 14/08/19 |
Internet address |
Keywords
- radio wave propagation
- ionosphere
- Sporadic E
- polarization
- measurement