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Title: Near real-time input to an HF propagation model for nowcasting of HF communications with aircraft on polar routes
Authors: Warrington, E. Michael
Stocker, A. J.
Siddle, D. R.
Hallam, J.
Zaalov, N. Y.
Honary, F.
Rogers, N. C.
Boteler, D. H.
Danskin, D. W.
First Published: 18-Aug-2015
Presented at: Ionospheric Effects Symposium, May 12-14, 2015 Alexandria, VA, USA
Start Date: 12-May-2015
End Date: 14-May-2015
Citation: Proceedings of the 14th International Ionospheric Effects Symposium, IES 2015, May 12-14, 2015, pp. 1056-1063
Abstract: The authors have previously reported on the development of an HF propagation model for signals reflected from the northerly regions of the ionosphere, and its validation by comparison with measurements made over a number of paths within the polar cap, crossing the auroral oval, and along the mid-latitude trough. The model incorporates various features (e.g. convecting patches of enhanced plasma density) of the polar ionosphere that are, in particular, responsible for off-great circle propagation and can lead to propagation at times and frequencies not expected from on-great circle propagation alone. Currently, the model drivers include ionosonde measurements and geomagnetic data from a period of several days spanning the time of interest. We have previously only examined the propagation effects on a historical basis, and have achieved good agreement between measurements and simulations. There is a need for improved techniques for nowcasting and forecasting (over several hours) HF propagation at northerly latitudes to support airlines operating over the increasingly popular trans-polar routes. This is an area currently being addressed by the assimilation of real-time measurements into the propagation model, including ionosonde measurements to define the background ionosphere and Total Electron Content (TEC) measurements as indicators of the presence and magnitude of polar patches. The effects of D-region absorption in the polar cap and auroral regions is integrated in the model through satellite and ground-based measurements. The model development is supported by the collection of HF propagation measurements over several paths within the polar cap, crossing the auroral oval, and along the mid-latitude trough.
Embargo on file until: 1-Jan-10000
Version: Post-print
Status: Peer-reviewed
Type: Conference Paper
Rights: Copyright © 2015. The file associated with this record is under a permanent embargo while its copyright status is ascertained. The full text may be available through the publisher links provided above.
Appears in Collections:Conference Papers & Presentations, Dept. of Engineering

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