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Auroral molecular-emission effects on the atomic oxygen line at 777.4 nm
ISEE Nagoya Univ, Chikusa Ku, F3-3 Furo, Nagoya, Aichi 4648601, Japan;Univ Oulu, Ionospher Phys Res Unit, Pentti Kaiteran Katu 1, Oulu 90014, Finland;Natl Inst Polar Res, 10-3 Midori Cho, Tachikawa, Tokyo 1908518, Japan.
Univ Electrocommun, 1-5-1 Chofugaoka, Chofu, Tokyo 1828585, Japan.
Univ Electrocommun, 1-5-1 Chofugaoka, Chofu, Tokyo 1828585, Japan.
Natl Inst Polar Res, 10-3 Midori Cho, Tachikawa, Tokyo 1908518, Japan.
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2018 (English)In: Earth Planets and Space, ISSN 1343-8832, E-ISSN 1880-5981, Vol. 70, article id 166Article in journal (Refereed) Published
Abstract [en]

One of the representative auroral emission lines that radiates from F-region heights and is measurable on the ground is the 777.4nm line from excited atomic oxygen. This line has been adopted, along with another E-region emission line, for example 427.8nm, to estimate the mean energy and total energy flux of precipitating auroral electrons. The influence of emissions from part of the molecular nitrogen band, which mainly radiate from E-region heights, should be carefully evaluated because it might overlap the 777.4nm atomic oxygen line in the spectrum. We performed statistical analysis of auroral spectrograph measurements that were obtained during the winter of 2016-2017 in TromsO, Norway, to derive the ratio of the intensity of the 777.4nm atomic oxygen line to that of the net measurement through a typically used optical filter with a full width at half maximum of a few nm. The ratio had a negative trend against geomagnetic activity, with a primary distribution of 0.5-0.7 and a minimum value of 0.3 for the most active auroral condition in this study. This result suggests that the 30-50% emission intensities measured through the optical filter may be from the molecular nitrogen band.

Place, publisher, year, edition, pages
SPRINGEROPEN , 2018. Vol. 70, article id 166
Keywords [en]
Aurora, Ionosphere, Magnetosphere, Spectrograph, EISCAT
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-369099DOI: 10.1186/s40623-018-0936-zISI: 000447655700001OAI: oai:DiVA.org:uu-369099DiVA, id: diva2:1289367
Available from: 2019-02-18 Created: 2019-02-18 Last updated: 2019-02-18Bibliographically approved

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Leyser, Thomas
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