GUVI Biblio




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Storm-time behaviors of O/N2 and NO variations



AuthorZhang, Y.; Paxton, L.J.; Morrison, D.; Marsh, D.; Kil, H.;
Keywordsgeomagnetic storm; Thermospheric nitric oxide; Thermospheric O/N2 ratio
Abstract

Algorithms have been developed to extract net nitric oxide (NO) radiances in the wavelength range of 172\textendash182\ nm from the dayside TIMED/GUVI spectrograph data and convert them to NO column density (100\textendash150\ km). The thermospheric O/N2 column density ratios (referenced from an altitude ~135\ km with a N2column density of 1017\ cm-2) are also obtained from the spectrograph data. The spatial resolution of the NO and O/N2 products along the GUVI orbit is 240\ km. The coincident O/N2 ratio and NO column density maps during a few geomagnetic storms reveal two major features: (1) Storm-time O/N2 depletion and NO enhancement extend from high to mid and low latitudes. They are anti-correlated on a global scale, (2) the NO enhancement covers a wider longitude and latitude region than O/N2 depletion on a local scale. The similarity between O/N2 depletion and NO enhancement on global scale is due to storm-time equatorward meridional wind that brings both O/N2 depleted and NO enhanced air from high to low latitudes. The altitude dependence of the storm-time meridional wind, different peaks altitudes of the local O/N2 and NO variations, and long life time of NO (one day or longer) may explain the different behaviors of O/N2 and NO on a local scale.

Year of Publication2014
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume114
Number of Pages42-49
Section
Date Published07/2014
ISBN
URLhttp://linkinghub.elsevier.com/retrieve/pii/S136468261400087X
DOI10.1016/j.jastp.2014.04.003