On the contribution of thermal excitation to the total 630.0 nm emissions in the northern cusp ionosphere
Source at http://dx.doi.org/10.1002/2016JA023366 Direct impact excitation by precipitating electrons is believed to be the main source of 630.0 nm emissions in the cusp ionosphere. However, this paper investigates a different source, 630.0 emissions caused by thermally excited atomic oxygen O(1D) wh...
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ftunivtroemsoe:oai:munin.uit.no:10037/11421 2023-05-15T16:04:29+02:00 On the contribution of thermal excitation to the total 630.0 nm emissions in the northern cusp ionosphere Kwagala, Norah Kaggwa Oksavik, Kjellmar Lorentzen, Dag Arne Johnsen, Magnar Gullikstad 2017-01-25 https://hdl.handle.net/10037/11421 https://doi.org/10.1002/2016JA023366 eng eng AGU Publications Journal of Geophysical Research - Space Physics Norges forskningsråd: 223252 eu-repo/grantAgreement/RCN/ROMFORSK/212014/Norway/SpaceWeatherEffectsInTheUpperAtmosphereOnNavigationSignals// FRIDAID 1438780 doi:10.1002/2016JA023366 2169-9380 2169-9402 https://hdl.handle.net/10037/11421 openAccess VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 Journal article Tidsskriftartikkel Peer reviewed 2017 ftunivtroemsoe https://doi.org/10.1002/2016JA023366 2021-06-25T17:55:22Z Source at http://dx.doi.org/10.1002/2016JA023366 Direct impact excitation by precipitating electrons is believed to be the main source of 630.0 nm emissions in the cusp ionosphere. However, this paper investigates a different source, 630.0 emissions caused by thermally excited atomic oxygen O(1D) when high electron temperature prevail in the cusp. On 22 January 2012 and 14 January 2013, the European Incoherent Scatter Scientific Association (EISCAT) radar on Svalbard measured electron temperature enhancements exceeding 3000 K near magnetic noon in the cusp ionosphere over Svalbard. The electron temperature enhancements corresponded to electron density enhancements exceeding 1011 m−3 accompanied by intense 630.0 nm emissions in a field of view common to both the EISCAT Svalbard radar and a meridian scanning photometer. This offered an excellent opportunity to investigate the role of thermally excited O(1D) 630.0 nm emissions in the cusp ionosphere. The thermal component was derived from the EISCAT Radar measurements and compared with optical data. For both events the calculated thermal component had a correlation coefficient greater than 0.8 to the total observed 630.0 nm intensity which contains both thermal and particle impact components. Despite fairly constant solar wind, the calculated thermal component intensity fluctuated possibly due to dayside transients in the aurora. Article in Journal/Newspaper EISCAT Svalbard University of Tromsø: Munin Open Research Archive Svalbard Journal of Geophysical Research: Space Physics 122 1 1234 1245 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 Kwagala, Norah Kaggwa Oksavik, Kjellmar Lorentzen, Dag Arne Johnsen, Magnar Gullikstad On the contribution of thermal excitation to the total 630.0 nm emissions in the northern cusp ionosphere |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 |
description |
Source at http://dx.doi.org/10.1002/2016JA023366 Direct impact excitation by precipitating electrons is believed to be the main source of 630.0 nm emissions in the cusp ionosphere. However, this paper investigates a different source, 630.0 emissions caused by thermally excited atomic oxygen O(1D) when high electron temperature prevail in the cusp. On 22 January 2012 and 14 January 2013, the European Incoherent Scatter Scientific Association (EISCAT) radar on Svalbard measured electron temperature enhancements exceeding 3000 K near magnetic noon in the cusp ionosphere over Svalbard. The electron temperature enhancements corresponded to electron density enhancements exceeding 1011 m−3 accompanied by intense 630.0 nm emissions in a field of view common to both the EISCAT Svalbard radar and a meridian scanning photometer. This offered an excellent opportunity to investigate the role of thermally excited O(1D) 630.0 nm emissions in the cusp ionosphere. The thermal component was derived from the EISCAT Radar measurements and compared with optical data. For both events the calculated thermal component had a correlation coefficient greater than 0.8 to the total observed 630.0 nm intensity which contains both thermal and particle impact components. Despite fairly constant solar wind, the calculated thermal component intensity fluctuated possibly due to dayside transients in the aurora. |
format |
Article in Journal/Newspaper |
author |
Kwagala, Norah Kaggwa Oksavik, Kjellmar Lorentzen, Dag Arne Johnsen, Magnar Gullikstad |
author_facet |
Kwagala, Norah Kaggwa Oksavik, Kjellmar Lorentzen, Dag Arne Johnsen, Magnar Gullikstad |
author_sort |
Kwagala, Norah Kaggwa |
title |
On the contribution of thermal excitation to the total 630.0 nm emissions in the northern cusp ionosphere |
title_short |
On the contribution of thermal excitation to the total 630.0 nm emissions in the northern cusp ionosphere |
title_full |
On the contribution of thermal excitation to the total 630.0 nm emissions in the northern cusp ionosphere |
title_fullStr |
On the contribution of thermal excitation to the total 630.0 nm emissions in the northern cusp ionosphere |
title_full_unstemmed |
On the contribution of thermal excitation to the total 630.0 nm emissions in the northern cusp ionosphere |
title_sort |
on the contribution of thermal excitation to the total 630.0 nm emissions in the northern cusp ionosphere |
publisher |
AGU Publications |
publishDate |
2017 |
url |
https://hdl.handle.net/10037/11421 https://doi.org/10.1002/2016JA023366 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
Journal of Geophysical Research - Space Physics Norges forskningsråd: 223252 eu-repo/grantAgreement/RCN/ROMFORSK/212014/Norway/SpaceWeatherEffectsInTheUpperAtmosphereOnNavigationSignals// FRIDAID 1438780 doi:10.1002/2016JA023366 2169-9380 2169-9402 https://hdl.handle.net/10037/11421 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1002/2016JA023366 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
122 |
container_issue |
1 |
container_start_page |
1234 |
op_container_end_page |
1245 |
_version_ |
1766400070974963712 |