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Application of the nudged elastic band method to the point-to-point radio wave ray tracing in IRI modeled ionosphere

Application of the nudged elastic band method to the point-to-point radio wave ray tracing in IRI modeled ionosphere


Title: Application of the nudged elastic band method to the point-to-point radio wave ray tracing in IRI modeled ionosphere
Author: Nosikov, I.A.
Klimenko, M.V.
Bessarab, Pavel   orcid.org/0000-0003-3351-7172
Zhbankov, G.A
Date: 2017-07
Language: English
Scope: 491-497
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Raunvísindastofnun (HÍ)
Science Institute (UI)
Series: Advances in Space Research;60(2)
ISSN: 0273-1177
DOI: 10.1016/j.asr.2016.12.003
Subject: Point-to-point ray tracing; Ionospheric radio; Fermat’s principle; Nudged elastic band method; IRI model; Traveling ionospheric disturbances; Bylgjufræði; Rafsegulbylgjur; Hitahvolf
URI: https://hdl.handle.net/20.500.11815/534

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Citation:

Nosikov, I. A., Klimenko, M. V., Bessarab, P. F., & Zhbankov, G. A. (2017). Application of the nudged elastic band method to the point-to-point radio wave ray tracing in IRI modeled ionosphere. Advances in Space Research, 60(2), 491-497. doi:https://doi.org/10.1016/j.asr.2016.12.003

Abstract:

Point-to-point ray tracing is an important problem in many fields of science. While direct variational methods where some trajectory is transformed to an optimal one are routinely used in calculations of pathways of seismic waves, chemical reactions, diffusion processes, etc., this approach is not widely known in ionospheric point-to-point ray tracing. We apply the Nudged Elastic Band (NEB) method to a radio wave propagation problem. In the NEB method, a chain of points which gives a discrete representation of the radio wave ray is adjusted iteratively to an optimal configuration satisfying the Fermat’s principle, while the endpoints of the trajectory are kept fixed according to the boundary conditions. Transverse displacements define the radio ray trajectory, while springs between the points control their distribution along the ray. The method is applied to a study of point-to-point ionospheric ray tracing, where the propagation medium is obtained with the International Reference Ionosphere model taking into account traveling ionospheric disturbances. A 2-dimensional representation of the optical path functional is developed and used to gain insight into the fundamental difference between high and low rays. We conclude that high and low rays are minima and saddle points of the optical path functional, respectively.

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Published by Elsevier Ltd. All rights reserved.

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