The altitude of green OI 557.7 nm and blue N<sub>2</sub><sup>+</sup> 427.8 nm aurora
Abstract O (1 D 2 1 S 0 nm) and blue N 2 + nm) aurora using observations from a network of all-sky cameras stationed across northern Finland and Sweden recorded during seven winter seasons from 2000 to 2007. Both emissions were found to typically peak at about 114 km. The distribution of blue peak altitudes is more skewed than that for the green, and the mean peak emission altitudes were 114.84 ± ± km for green and blue emissions, respectively. We compare simultaneous measurements of the two emissions in combination with auroral modelling to investigate the emission production mechanisms. < ∼ 4 keV), when the two emissions peak above about 110 km, it is more likely for the green emission to peak below the blue emission than vice versa, with the difference between the two heights increasing with their average. Modelling has shown that under these conditions the dominant source of O (1 S), the upper state of the green line, is energy transfer from excited N 2 A 3 Σ u + N 2 O number densities. Since both number densities decrease with higher altitude, the production of O (1 S) by energy transfer from N 2 N 2 N 2 km, they typically peak at very similar altitude. The dominant source of O (1 S) at low altitudes must not be energy transfer from N 2 N 2 N 2 O 2 + O (1 S) unaccounted for.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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The altitude of green OI 557.7 nm and blue N2+ 427.8 nm aurora ; volume:41 ; number:1 ; year:2023 ; pages:1-12 ; extent:12
Annales geophysicae ; 41, Heft 1 (2023), 1-12 (gesamt 12)
- Urheber
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Whiter, Daniel K.
Partamies, Noora
Gustavsson, Björn
Kauristie, Kirsti
- DOI
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10.5194/angeo-41-1-2023
- URN
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urn:nbn:de:101:1-2023011204312465619004
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:31 MESZ
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Beteiligte
- Whiter, Daniel K.
- Partamies, Noora
- Gustavsson, Björn
- Kauristie, Kirsti
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