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Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements

Research output: Contribution to conference - Without ISBN/ISSN Abstractpeer-review

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Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements. / Rogers, Neil Christopher; Honary, Farideh; Warrington, EM; Stocker, A. J.; Danskin, Donald W.

2016. 2381-2381 Abstract from European Geosciences Union General Assembly 2016, Vienna, Austria, Austria.

Research output: Contribution to conference - Without ISBN/ISSN Abstractpeer-review

Harvard

Rogers, NC, Honary, F, Warrington, EM, Stocker, AJ & Danskin, DW 2016, 'Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements', European Geosciences Union General Assembly 2016, Vienna, Austria, Austria, 17/04/16 - 22/04/16 pp. 2381-2381. <http://meetingorganizer.copernicus.org/EGU2016/EGU2016-2381.pdf>

APA

Rogers, N. C., Honary, F., Warrington, EM., Stocker, A. J., & Danskin, D. W. (2016). Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements. 2381-2381. Abstract from European Geosciences Union General Assembly 2016, Vienna, Austria, Austria. http://meetingorganizer.copernicus.org/EGU2016/EGU2016-2381.pdf

Vancouver

Rogers NC, Honary F, Warrington EM, Stocker AJ, Danskin DW. Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements. 2016. Abstract from European Geosciences Union General Assembly 2016, Vienna, Austria, Austria.

Author

Rogers, Neil Christopher ; Honary, Farideh ; Warrington, EM ; Stocker, A. J. ; Danskin, Donald W. / Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements. Abstract from European Geosciences Union General Assembly 2016, Vienna, Austria, Austria.1 p.

Bibtex

@conference{77d9ee87e4f74a9c8a7c2df26ee09c90,
title = "Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements",
abstract = "A real-time model of HF radio propagation conditions is being developed as a service for aircraft communications at high latitudes. An essential component of this is a real-time map of the absorption of HF (3-30 MHz) radio signals in the D-region ionosphere. Empirical, climatological Polar Cap Absorption (PCA) models in common usage cannot account for day-to-day variations in ionospheric composition and are inaccurate during the large changes in recombination rate at twilight. However, parameters of such models may be optimised using an age-weighted regression to absorption measurements from riometers in Canada and Scandinavia. Such parameters include the day- and night-time sensitivity to proton flux as measured on a geostationary satellite (GOES). Modelling the twilight transition as a linear or Gauss error function over a range of solar-zenith angles (χl < χ < χu) is found to provide greater accuracy than {\textquoteleft}Earth shadow{\textquoteright} methods (as applied in the Sodankyl{\"a} Ionospheric Chemistry (SIC) model, for example) due to a more gradual ionospheric response for χ < 90°. The fitted χl parameter is found to be most variable, with smaller values (as low as 60°) post-sunrise compared with pre-sunset. Correlation coefficients of model parameters between riometers are presented and these provide a means of appropriately weighting individual riometer contributions in an assimilative PCA model. At times outside of PCA events, the probability of absorption in the auroral zones is related to the energetic electron flux inside the precipitation loss cone, as measured on the polar-orbiting POES satellites. This varies with magnetic local time, magnetic latitude and geomagnetic activity, and its relation to the real-time solar wind – magnetospheric coupling function [Newell et al., 2007] will be presented. ",
author = "Rogers, {Neil Christopher} and Farideh Honary and EM Warrington and Stocker, {A. J.} and Danskin, {Donald W.}",
note = "Geophysical Research Abstracts Vol. 18, EGU2016-2381, 2016; European Geosciences Union General Assembly 2016 ; Conference date: 17-04-2016 Through 22-04-2016",
year = "2016",
month = mar,
language = "English",
pages = "2381--2381",

}

RIS

TY - CONF

T1 - Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements

AU - Rogers, Neil Christopher

AU - Honary, Farideh

AU - Warrington, EM

AU - Stocker, A. J.

AU - Danskin, Donald W.

N1 - Geophysical Research Abstracts Vol. 18, EGU2016-2381, 2016

PY - 2016/3

Y1 - 2016/3

N2 - A real-time model of HF radio propagation conditions is being developed as a service for aircraft communications at high latitudes. An essential component of this is a real-time map of the absorption of HF (3-30 MHz) radio signals in the D-region ionosphere. Empirical, climatological Polar Cap Absorption (PCA) models in common usage cannot account for day-to-day variations in ionospheric composition and are inaccurate during the large changes in recombination rate at twilight. However, parameters of such models may be optimised using an age-weighted regression to absorption measurements from riometers in Canada and Scandinavia. Such parameters include the day- and night-time sensitivity to proton flux as measured on a geostationary satellite (GOES). Modelling the twilight transition as a linear or Gauss error function over a range of solar-zenith angles (χl < χ < χu) is found to provide greater accuracy than ‘Earth shadow’ methods (as applied in the Sodankylä Ionospheric Chemistry (SIC) model, for example) due to a more gradual ionospheric response for χ < 90°. The fitted χl parameter is found to be most variable, with smaller values (as low as 60°) post-sunrise compared with pre-sunset. Correlation coefficients of model parameters between riometers are presented and these provide a means of appropriately weighting individual riometer contributions in an assimilative PCA model. At times outside of PCA events, the probability of absorption in the auroral zones is related to the energetic electron flux inside the precipitation loss cone, as measured on the polar-orbiting POES satellites. This varies with magnetic local time, magnetic latitude and geomagnetic activity, and its relation to the real-time solar wind – magnetospheric coupling function [Newell et al., 2007] will be presented.

AB - A real-time model of HF radio propagation conditions is being developed as a service for aircraft communications at high latitudes. An essential component of this is a real-time map of the absorption of HF (3-30 MHz) radio signals in the D-region ionosphere. Empirical, climatological Polar Cap Absorption (PCA) models in common usage cannot account for day-to-day variations in ionospheric composition and are inaccurate during the large changes in recombination rate at twilight. However, parameters of such models may be optimised using an age-weighted regression to absorption measurements from riometers in Canada and Scandinavia. Such parameters include the day- and night-time sensitivity to proton flux as measured on a geostationary satellite (GOES). Modelling the twilight transition as a linear or Gauss error function over a range of solar-zenith angles (χl < χ < χu) is found to provide greater accuracy than ‘Earth shadow’ methods (as applied in the Sodankylä Ionospheric Chemistry (SIC) model, for example) due to a more gradual ionospheric response for χ < 90°. The fitted χl parameter is found to be most variable, with smaller values (as low as 60°) post-sunrise compared with pre-sunset. Correlation coefficients of model parameters between riometers are presented and these provide a means of appropriately weighting individual riometer contributions in an assimilative PCA model. At times outside of PCA events, the probability of absorption in the auroral zones is related to the energetic electron flux inside the precipitation loss cone, as measured on the polar-orbiting POES satellites. This varies with magnetic local time, magnetic latitude and geomagnetic activity, and its relation to the real-time solar wind – magnetospheric coupling function [Newell et al., 2007] will be presented.

M3 - Abstract

SP - 2381

EP - 2381

T2 - European Geosciences Union General Assembly 2016

Y2 - 17 April 2016 through 22 April 2016

ER -