The relationship between small-scale and large-scale ionospheric electron density irregularities generated by powerful HF electromagnetic waves at high latitudes

Satellite radio beacons were used in June 2001 to probe the ionosphere modified by a radio beam produced by the EISCAT high-power, high-frequency (HF) transmitter located near Tromsø (Norway). Amplitude scintillations and variations of the phase of 150- and 400-MHz signals from Russian navigational...

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Published in:Annales Geophysicae
Main Authors: Tereshchenko, E. D., Khudukon, B. Z., Rietveld, M. T., Isham, B., Hagfors, T., Brekke, A.
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2006
Subjects:
Online Access:https://doi.org/10.5194/angeo-24-2901-2006
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spelling ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00032873 2023-05-15T16:04:49+02:00 The relationship between small-scale and large-scale ionospheric electron density irregularities generated by powerful HF electromagnetic waves at high latitudes Tereshchenko, E. D. Khudukon, B. Z. Rietveld, M. T. Isham, B. Hagfors, T. Brekke, A. 2006-11 electronic https://doi.org/10.5194/angeo-24-2901-2006 https://noa.gwlb.de/receive/cop_mods_00032873 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032827/angeo-24-2901-2006.pdf https://angeo.copernicus.org/articles/24/2901/2006/angeo-24-2901-2006.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-24-2901-2006 https://noa.gwlb.de/receive/cop_mods_00032873 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032827/angeo-24-2901-2006.pdf https://angeo.copernicus.org/articles/24/2901/2006/angeo-24-2901-2006.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2006 ftnonlinearchiv https://doi.org/10.5194/angeo-24-2901-2006 2022-02-08T22:46:02Z Satellite radio beacons were used in June 2001 to probe the ionosphere modified by a radio beam produced by the EISCAT high-power, high-frequency (HF) transmitter located near Tromsø (Norway). Amplitude scintillations and variations of the phase of 150- and 400-MHz signals from Russian navigational satellites passing over the modified region were observed at three receiver sites. In several papers it has been stressed that in the polar ionosphere the thermal self-focusing on striations during ionospheric modification is the main mechanism resulting in the formation of large-scale (hundreds of meters to kilometers) nonlinear structures aligned along the geomagnetic field (magnetic zenith effect). It has also been claimed that the maximum effects caused by small-scale (tens of meters) irregularities detected in satellite signals are also observed in the direction parallel to the magnetic field. Contrary to those studies, the present paper shows that the maximum in amplitude scintillations does not correspond strictly to the magnetic zenith direction because high latitude drifts typically cause a considerable anisotropy of small-scale irregularities in a plane perpendicular to the geomagnetic field resulting in a deviation of the amplitude-scintillation peak relative to the minimum angle between the line-of-sight to the satellite and direction of the geomagnetic field lines. The variance of the logarithmic relative amplitude fluctuations is considered here, which is a useful quantity in such studies. The experimental values of the variance are compared with model calculations and good agreement has been found. It is also shown from the experimental data that in most of the satellite passes a variance maximum occurs at a minimum in the phase fluctuations indicating that the artificial excitation of large-scale irregularities is minimum when the excitation of small-scale irregularities is maximum. Article in Journal/Newspaper EISCAT Tromsø Niedersächsisches Online-Archiv NOA Norway Tromsø Annales Geophysicae 24 11 2901 2909
institution Open Polar
collection Niedersächsisches Online-Archiv NOA
op_collection_id ftnonlinearchiv
language English
topic article
Verlagsveröffentlichung
spellingShingle article
Verlagsveröffentlichung
Tereshchenko, E. D.
Khudukon, B. Z.
Rietveld, M. T.
Isham, B.
Hagfors, T.
Brekke, A.
The relationship between small-scale and large-scale ionospheric electron density irregularities generated by powerful HF electromagnetic waves at high latitudes
topic_facet article
Verlagsveröffentlichung
description Satellite radio beacons were used in June 2001 to probe the ionosphere modified by a radio beam produced by the EISCAT high-power, high-frequency (HF) transmitter located near Tromsø (Norway). Amplitude scintillations and variations of the phase of 150- and 400-MHz signals from Russian navigational satellites passing over the modified region were observed at three receiver sites. In several papers it has been stressed that in the polar ionosphere the thermal self-focusing on striations during ionospheric modification is the main mechanism resulting in the formation of large-scale (hundreds of meters to kilometers) nonlinear structures aligned along the geomagnetic field (magnetic zenith effect). It has also been claimed that the maximum effects caused by small-scale (tens of meters) irregularities detected in satellite signals are also observed in the direction parallel to the magnetic field. Contrary to those studies, the present paper shows that the maximum in amplitude scintillations does not correspond strictly to the magnetic zenith direction because high latitude drifts typically cause a considerable anisotropy of small-scale irregularities in a plane perpendicular to the geomagnetic field resulting in a deviation of the amplitude-scintillation peak relative to the minimum angle between the line-of-sight to the satellite and direction of the geomagnetic field lines. The variance of the logarithmic relative amplitude fluctuations is considered here, which is a useful quantity in such studies. The experimental values of the variance are compared with model calculations and good agreement has been found. It is also shown from the experimental data that in most of the satellite passes a variance maximum occurs at a minimum in the phase fluctuations indicating that the artificial excitation of large-scale irregularities is minimum when the excitation of small-scale irregularities is maximum.
format Article in Journal/Newspaper
author Tereshchenko, E. D.
Khudukon, B. Z.
Rietveld, M. T.
Isham, B.
Hagfors, T.
Brekke, A.
author_facet Tereshchenko, E. D.
Khudukon, B. Z.
Rietveld, M. T.
Isham, B.
Hagfors, T.
Brekke, A.
author_sort Tereshchenko, E. D.
title The relationship between small-scale and large-scale ionospheric electron density irregularities generated by powerful HF electromagnetic waves at high latitudes
title_short The relationship between small-scale and large-scale ionospheric electron density irregularities generated by powerful HF electromagnetic waves at high latitudes
title_full The relationship between small-scale and large-scale ionospheric electron density irregularities generated by powerful HF electromagnetic waves at high latitudes
title_fullStr The relationship between small-scale and large-scale ionospheric electron density irregularities generated by powerful HF electromagnetic waves at high latitudes
title_full_unstemmed The relationship between small-scale and large-scale ionospheric electron density irregularities generated by powerful HF electromagnetic waves at high latitudes
title_sort relationship between small-scale and large-scale ionospheric electron density irregularities generated by powerful hf electromagnetic waves at high latitudes
publisher Copernicus Publications
publishDate 2006
url https://doi.org/10.5194/angeo-24-2901-2006
https://noa.gwlb.de/receive/cop_mods_00032873
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032827/angeo-24-2901-2006.pdf
https://angeo.copernicus.org/articles/24/2901/2006/angeo-24-2901-2006.pdf
geographic Norway
Tromsø
geographic_facet Norway
Tromsø
genre EISCAT
Tromsø
genre_facet EISCAT
Tromsø
op_relation Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576
https://doi.org/10.5194/angeo-24-2901-2006
https://noa.gwlb.de/receive/cop_mods_00032873
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032827/angeo-24-2901-2006.pdf
https://angeo.copernicus.org/articles/24/2901/2006/angeo-24-2901-2006.pdf
op_rights uneingeschränkt
info:eu-repo/semantics/openAccess
op_doi https://doi.org/10.5194/angeo-24-2901-2006
container_title Annales Geophysicae
container_volume 24
container_issue 11
container_start_page 2901
op_container_end_page 2909
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