Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements
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 Absor...
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ftulancaster:oai:eprints.lancs.ac.uk:78573 2023-08-27T04:11:59+02:00 Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements Rogers, Neil Christopher Honary, Farideh Warrington, EM Stocker, A. J. Danskin, Donald W. 2016-03 https://eprints.lancs.ac.uk/id/eprint/78573/ unknown Rogers, Neil Christopher and Honary, Farideh and Warrington, EM and Stocker, A. J. and Danskin, Donald W. (2016) Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements. In: European Geosciences Union General Assembly 2016, 2016-04-172016-04-22, Austria Centre Vienna. Contribution to Conference PeerReviewed 2016 ftulancaster 2023-08-03T22:29:01Z 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. Conference Object Sodankylä Lancaster University: Lancaster Eprints Canada Newell ENVELOPE(-59.533,-59.533,-62.333,-62.333) Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) |
institution |
Open Polar |
collection |
Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
unknown |
description |
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. |
format |
Conference Object |
author |
Rogers, Neil Christopher Honary, Farideh Warrington, EM Stocker, A. J. Danskin, Donald W. |
spellingShingle |
Rogers, Neil Christopher Honary, Farideh Warrington, EM Stocker, A. J. Danskin, Donald W. Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements |
author_facet |
Rogers, Neil Christopher Honary, Farideh Warrington, EM Stocker, A. J. Danskin, Donald W. |
author_sort |
Rogers, Neil Christopher |
title |
Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements |
title_short |
Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements |
title_full |
Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements |
title_fullStr |
Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements |
title_full_unstemmed |
Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements |
title_sort |
real-time hf radio absorption maps incorporating riometer and satellite measurements |
publishDate |
2016 |
url |
https://eprints.lancs.ac.uk/id/eprint/78573/ |
long_lat |
ENVELOPE(-59.533,-59.533,-62.333,-62.333) ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Canada Newell Sodankylä |
geographic_facet |
Canada Newell Sodankylä |
genre |
Sodankylä |
genre_facet |
Sodankylä |
op_relation |
Rogers, Neil Christopher and Honary, Farideh and Warrington, EM and Stocker, A. J. and Danskin, Donald W. (2016) Real-time HF Radio Absorption Maps Incorporating Riometer and Satellite Measurements. In: European Geosciences Union General Assembly 2016, 2016-04-172016-04-22, Austria Centre Vienna. |
_version_ |
1775355703308845056 |