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Storm-time variations of atomic nitrogen 149.3 nm emission


AuthorZhang, Y.; Paxton, L.J.; Morrison, D.; Schaefer, B.;
Keywords
Abstract

Net radiances of atomic nitrogen emission line (N-149.3 nm) from the thermosphere are extracted from the FUV spectra observed by TIMED/GUVI on dayside at sunlit latitudes. During geomagnetic storms, the N-149.3 nm intensity is clearly enhanced in the locations where O/N2 depletion and nitric oxide (NO) enhancement are observed. The N-149.3 nm intensity is linearly and tightly correlated with N2 LBHS (140\textendash150 nm) radiance with a fixed LBHS/149.3 nm ratio of \~4.5, suggesting that dissociation of N2 is the dominant source of the N-149.3 nm emission. In the regions without storm disturbances, the N-149.3 nm intensities are closely correlated with solar EUV flux.

Year of Publication2018
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume169
Number of Pages78-82
Section
Date Published04/2018
ISBN
URLhttps://linkinghub.elsevier.com/retrieve/pii/S1364682617306004
DOI10.1016/j.jastp.2018.01.023