Modelling of optical emissions enhanced by the HF pumping of the ionospheric F-region
Strong enhancement of the optical emissions with excitation threshold from 1.96 eV (630.0 nm from O(1D)) up to 18.75 eV (427.8 nm from N2+(1NG)) have been observed during experiments of the ionosphere modification by high power HF radio waves. Analysis of the optical emission ratios showed clearly t...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00025754 2023-05-15T16:04:47+02:00 Modelling of optical emissions enhanced by the HF pumping of the ionospheric F-region Sergienko, T. Gustavsson, B. Brändström, U. Axelsson, K. 2012-05 electronic https://doi.org/10.5194/angeo-30-885-2012 https://noa.gwlb.de/receive/cop_mods_00025754 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00025709/angeo-30-885-2012.pdf https://angeo.copernicus.org/articles/30/885/2012/angeo-30-885-2012.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-30-885-2012 https://noa.gwlb.de/receive/cop_mods_00025754 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00025709/angeo-30-885-2012.pdf https://angeo.copernicus.org/articles/30/885/2012/angeo-30-885-2012.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2012 ftnonlinearchiv https://doi.org/10.5194/angeo-30-885-2012 2022-02-08T22:49:34Z Strong enhancement of the optical emissions with excitation threshold from 1.96 eV (630.0 nm from O(1D)) up to 18.75 eV (427.8 nm from N2+(1NG)) have been observed during experiments of the ionosphere modification by high power HF radio waves. Analysis of the optical emission ratios showed clearly that a significant part of the ionospheric electrons have to be accelerated to energies above 30 eV and more in the region where the HF radio wave effectively interacts with the ionospheric plasma. The Monte-Carlo model of electron transport and the optical emission model were used to study the dependence of the optical emission intensity on the acceleration electron parameters. We obtained the following results from analysis of the enhanced intensities of the four optical emissions (630.0, 557.7, 844.6 and 427.8 nm) observed in the EISCAT heating experiment on 10 March 2002. The 630.0 emission with an excitation threshold of 1.96 eV is formed predominately by the thermal electrons, where the accelerated electrons play a minor role in the excitation of this emission. In order to explain the experimentally observed intensity ratios, the accelerated electrons must gain energies of more than 60 eV. For accelerated electrons with a power law energy dependence, the efficiency of the optical emission excitation depends on the exponent defining the shape of the electron spectra. However, an agreement with the observed emission intensities is achieved for exponent values not less than zero. Moreover, increasing the exponent to higher values does not affect the emission intensity ratios. Article in Journal/Newspaper EISCAT Niedersächsisches Online-Archiv NOA Annales Geophysicae 30 5 885 895 |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Sergienko, T. Gustavsson, B. Brändström, U. Axelsson, K. Modelling of optical emissions enhanced by the HF pumping of the ionospheric F-region |
topic_facet |
article Verlagsveröffentlichung |
description |
Strong enhancement of the optical emissions with excitation threshold from 1.96 eV (630.0 nm from O(1D)) up to 18.75 eV (427.8 nm from N2+(1NG)) have been observed during experiments of the ionosphere modification by high power HF radio waves. Analysis of the optical emission ratios showed clearly that a significant part of the ionospheric electrons have to be accelerated to energies above 30 eV and more in the region where the HF radio wave effectively interacts with the ionospheric plasma. The Monte-Carlo model of electron transport and the optical emission model were used to study the dependence of the optical emission intensity on the acceleration electron parameters. We obtained the following results from analysis of the enhanced intensities of the four optical emissions (630.0, 557.7, 844.6 and 427.8 nm) observed in the EISCAT heating experiment on 10 March 2002. The 630.0 emission with an excitation threshold of 1.96 eV is formed predominately by the thermal electrons, where the accelerated electrons play a minor role in the excitation of this emission. In order to explain the experimentally observed intensity ratios, the accelerated electrons must gain energies of more than 60 eV. For accelerated electrons with a power law energy dependence, the efficiency of the optical emission excitation depends on the exponent defining the shape of the electron spectra. However, an agreement with the observed emission intensities is achieved for exponent values not less than zero. Moreover, increasing the exponent to higher values does not affect the emission intensity ratios. |
format |
Article in Journal/Newspaper |
author |
Sergienko, T. Gustavsson, B. Brändström, U. Axelsson, K. |
author_facet |
Sergienko, T. Gustavsson, B. Brändström, U. Axelsson, K. |
author_sort |
Sergienko, T. |
title |
Modelling of optical emissions enhanced by the HF pumping of the ionospheric F-region |
title_short |
Modelling of optical emissions enhanced by the HF pumping of the ionospheric F-region |
title_full |
Modelling of optical emissions enhanced by the HF pumping of the ionospheric F-region |
title_fullStr |
Modelling of optical emissions enhanced by the HF pumping of the ionospheric F-region |
title_full_unstemmed |
Modelling of optical emissions enhanced by the HF pumping of the ionospheric F-region |
title_sort |
modelling of optical emissions enhanced by the hf pumping of the ionospheric f-region |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/angeo-30-885-2012 https://noa.gwlb.de/receive/cop_mods_00025754 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00025709/angeo-30-885-2012.pdf https://angeo.copernicus.org/articles/30/885/2012/angeo-30-885-2012.pdf |
genre |
EISCAT |
genre_facet |
EISCAT |
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-30-885-2012 https://noa.gwlb.de/receive/cop_mods_00025754 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00025709/angeo-30-885-2012.pdf https://angeo.copernicus.org/articles/30/885/2012/angeo-30-885-2012.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/angeo-30-885-2012 |
container_title |
Annales Geophysicae |
container_volume |
30 |
container_issue |
5 |
container_start_page |
885 |
op_container_end_page |
895 |
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1766400414748508160 |