Investigation of the polarization of 50 MHz signals via Sporadic-E reflection

Chris Deacon, Benjamin Witvliet, Cathryn N. M. Mitchell

Research output: Contribution to conferencePaperAcademicpeer-review

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.
Original languageEnglish
Pages1-9
Number of pages9
Publication statusPublished - 12 Aug 2019
EventNordic HF conference 2019 - Fårö kursgård camp, Fårö, Sweden
Duration: 12 Nov 201914 Nov 2019
http://www.nordichf.org/index.htm?index2.htm&2

Conference

ConferenceNordic HF conference 2019
Abbreviated titleNordic HF
CountrySweden
CityFårö
Period12/11/1914/11/19
Internet address

Fingerprint

ionospheres
fading
polarization
sporadic E layer
cross polarization
radio waves
solar cycles
ionospherics
communication
predictions

Keywords

  • ionosphere
  • radio wave propagation
  • Sporadic E
  • polarization

Cite this

Deacon, C., Witvliet, B., & Mitchell, C. N. M. (2019). Investigation of the polarization of 50 MHz signals via Sporadic-E reflection. 1-9. Paper presented at Nordic HF conference 2019, Fårö, Sweden.
Deacon, Chris ; Witvliet, Benjamin ; Mitchell, Cathryn N. M. / Investigation of the polarization of 50 MHz signals via Sporadic-E reflection. Paper presented at Nordic HF conference 2019, Fårö, Sweden.9 p.
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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.",
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Deacon, C, Witvliet, B & Mitchell, CNM 2019, 'Investigation of the polarization of 50 MHz signals via Sporadic-E reflection' Paper presented at Nordic HF conference 2019, Fårö, Sweden, 12/11/19 - 14/11/19, pp. 1-9.

Investigation of the polarization of 50 MHz signals via Sporadic-E reflection. / Deacon, Chris; Witvliet, Benjamin; Mitchell, Cathryn N. M.

2019. 1-9 Paper presented at Nordic HF conference 2019, Fårö, Sweden.

Research output: Contribution to conferencePaperAcademicpeer-review

TY - CONF

T1 - Investigation of the polarization of 50 MHz signals via Sporadic-E reflection

AU - Deacon, Chris

AU - Witvliet, Benjamin

AU - Mitchell, Cathryn N. M.

PY - 2019/8/12

Y1 - 2019/8/12

N2 - 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.

AB - 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.

KW - ionosphere

KW - radio wave propagation

KW - Sporadic E

KW - polarization

M3 - Paper

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Deacon C, Witvliet B, Mitchell CNM. Investigation of the polarization of 50 MHz signals via Sporadic-E reflection. 2019. Paper presented at Nordic HF conference 2019, Fårö, Sweden.