On mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude F-region ionosphere
The EISCAT (European Incoherent Scatter Scientific Association) Heating facility was used to transmit powerful high-frequency (HF) electromagnetic waves into the Fregion ionosphere to enhance optical emissions at 557.7 and 630.0 nm from atomic oxygen. The emissions were imaged by several stations of...
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Online Access: | https://hdl.handle.net/10037/32445 https://doi.org/10.5194/angeo-41-589-2023 |
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ftunivtroemsoe:oai:munin.uit.no:10037/32445 2024-02-11T10:03:28+01:00 On mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude F-region ionosphere Leyser, Thomas B. Sergienko, Tima Brändström, Urban Gustavsson, Björn Johan Rietveld, Michael T. 2023-12-13 https://hdl.handle.net/10037/32445 https://doi.org/10.5194/angeo-41-589-2023 eng eng Copernicus Publications Annales Geophysicae Leyser, Sergienko, Brändström, Gustavsson, Rietveld. On mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude F-region ionosphere. Annales Geophysicae. 2023;41(2):589-600 FRIDAID 2223656 doi:10.5194/angeo-41-589-2023 0992-7689 1432-0576 https://hdl.handle.net/10037/32445 Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2023 ftunivtroemsoe https://doi.org/10.5194/angeo-41-589-2023 2024-01-18T00:08:05Z The EISCAT (European Incoherent Scatter Scientific Association) Heating facility was used to transmit powerful high-frequency (HF) electromagnetic waves into the Fregion ionosphere to enhance optical emissions at 557.7 and 630.0 nm from atomic oxygen. The emissions were imaged by several stations of ALIS (Auroral Large Imaging System) in northern Sweden, and the EISCAT UHF incoherent scatter radar was used to obtain plasma parameter values. The ratio of the 557.7 to 630.0 nm column emission rates changed from I 5577 /I 6300 ≈ 0.2 for the HF pump frequency f 0 = 6.200 MHz ≈ 4.6f e to I 5577 /I 6300 ≈ 0.5 when f 0 = 5.423 MHz . 4f e , where f e is the ionospheric electron gyro frequency. The observations are interpreted in terms of decreased electron heating efficiency and thereby weaker enhancement at 630.0 nm for f 0 = 5.423 MHz . 4 f e . The emissions at 557.7 nm are attributed to electron acceleration by upper hybrid waves of metre-scale wavelengths that can be excited with f 0 = 5.423 MHz . 4 f e . Article in Journal/Newspaper EISCAT Northern Sweden University of Tromsø: Munin Open Research Archive Annales Geophysicae 41 2 589 600 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
The EISCAT (European Incoherent Scatter Scientific Association) Heating facility was used to transmit powerful high-frequency (HF) electromagnetic waves into the Fregion ionosphere to enhance optical emissions at 557.7 and 630.0 nm from atomic oxygen. The emissions were imaged by several stations of ALIS (Auroral Large Imaging System) in northern Sweden, and the EISCAT UHF incoherent scatter radar was used to obtain plasma parameter values. The ratio of the 557.7 to 630.0 nm column emission rates changed from I 5577 /I 6300 ≈ 0.2 for the HF pump frequency f 0 = 6.200 MHz ≈ 4.6f e to I 5577 /I 6300 ≈ 0.5 when f 0 = 5.423 MHz . 4f e , where f e is the ionospheric electron gyro frequency. The observations are interpreted in terms of decreased electron heating efficiency and thereby weaker enhancement at 630.0 nm for f 0 = 5.423 MHz . 4 f e . The emissions at 557.7 nm are attributed to electron acceleration by upper hybrid waves of metre-scale wavelengths that can be excited with f 0 = 5.423 MHz . 4 f e . |
format |
Article in Journal/Newspaper |
author |
Leyser, Thomas B. Sergienko, Tima Brändström, Urban Gustavsson, Björn Johan Rietveld, Michael T. |
spellingShingle |
Leyser, Thomas B. Sergienko, Tima Brändström, Urban Gustavsson, Björn Johan Rietveld, Michael T. On mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude F-region ionosphere |
author_facet |
Leyser, Thomas B. Sergienko, Tima Brändström, Urban Gustavsson, Björn Johan Rietveld, Michael T. |
author_sort |
Leyser, Thomas B. |
title |
On mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude F-region ionosphere |
title_short |
On mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude F-region ionosphere |
title_full |
On mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude F-region ionosphere |
title_fullStr |
On mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude F-region ionosphere |
title_full_unstemmed |
On mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude F-region ionosphere |
title_sort |
on mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude f-region ionosphere |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://hdl.handle.net/10037/32445 https://doi.org/10.5194/angeo-41-589-2023 |
genre |
EISCAT Northern Sweden |
genre_facet |
EISCAT Northern Sweden |
op_relation |
Annales Geophysicae Leyser, Sergienko, Brändström, Gustavsson, Rietveld. On mechanisms for high-frequency pump-enhanced optical emissions at 557.7 and 630.0gnm from atomic oxygen in the high-latitude F-region ionosphere. Annales Geophysicae. 2023;41(2):589-600 FRIDAID 2223656 doi:10.5194/angeo-41-589-2023 0992-7689 1432-0576 https://hdl.handle.net/10037/32445 |
op_rights |
Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.5194/angeo-41-589-2023 |
container_title |
Annales Geophysicae |
container_volume |
41 |
container_issue |
2 |
container_start_page |
589 |
op_container_end_page |
600 |
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1790599711417171968 |