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dc.contributor.authorOyama, Shin-Ichiro
dc.contributor.authorTsuda, Takuo T.
dc.contributor.authorHosokawa, Keisuke
dc.contributor.authorOgawa, Yasunobu
dc.contributor.authorMiyoshi, Yoshizumi
dc.contributor.authorKurita, Satoshi
dc.contributor.authorKero, Antti
dc.contributor.authorFujii, Ryochi
dc.contributor.authorTanaka, Yoshimasa
dc.contributor.authorMizuno, Akira
dc.contributor.authorKawabata, Tetsuya
dc.contributor.authorGustavsson, Björn Johan
dc.contributor.authorLeyser, Thomas
dc.date.accessioned2019-02-19T11:18:37Z
dc.date.available2019-02-19T11:18:37Z
dc.date.issued2018-10-16
dc.description.abstractOne of the representative auroral emission lines that radiates from F-region heights and is measurable on the ground is the 777.4 nm line from excited atomic oxygen. This line has been adopted, along with another E-region emission line, for example 427.8 nm, 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 777.4 nm atomic oxygen line in the spectrum. We performed statistical analysis of auroral spectrograph measurements that were obtained during the winter of 2016–2017 in Tromsø, Norway, to derive the ratio of the intensity of the 777.4 nm 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.en_US
dc.description.sponsorshipGrant-in-Aid for Scientific Research Special Funds for Education and Research (Energy Transport Processes in Geospace) from MEXT, Japanen_US
dc.descriptionSource at <a href=https://doi.org/10.1186/s40623-018-0936-z> https://doi.org/10.1186/s40623-018-0936-z</a>.en_US
dc.identifier.citationOyama, S., Tsuda, T.T., Hosokawa, K., Ogawa, Y., Miyoshi, Y., Kurita, S., ... Leyser, T. (2018). Auroral molecular-emission effects on the atomic oxygen line at 777.4 nm. <i>Earth Planets and Space, 70</i>(166). https://doi.org/10.1186/s40623-018-0936-zen_US
dc.identifier.cristinIDFRIDAID 1674549
dc.identifier.doi10.1186/s40623-018-0936-z
dc.identifier.issn1343-8832
dc.identifier.issn1880-5981
dc.identifier.urihttps://hdl.handle.net/10037/14717
dc.language.isoengen_US
dc.publisherSpringerOpenen_US
dc.relation.journalEarth Planets and Space
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430en_US
dc.subjectAuroraen_US
dc.subjectIonosphereen_US
dc.subjectMagnetosphereen_US
dc.subjectSpectrographen_US
dc.subjectEISCATen_US
dc.titleAuroral molecular-emission effects on the atomic oxygen line at 777.4 nmen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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