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\begin{document}

\title{First results from the retrieved column O/N2 ratio from the Ionospheric
Connection Explorer (ICON): Longitudinal structures induced by
nonmigrating tides}



\author[1]{Scott L England}%
\author[2]{Robert R. Meier}%
\author[3]{Harald U. Frey}%
\author[3]{Stephen B Mende}%
\author[4]{Andrew W. Stephan}%
\author[1]{Christopher Scott Krier}%
\author[3]{Chihoko Y. Cullens}%
\author[3]{Yen-Jung Joanne Wu}%
\author[5]{Colin C Triplett}%
\author[5]{Martin M Sirk}%
\author[3]{Eric Korpela}%
\author[6]{Brian J Harding}%
\author[7]{Christoph R Englert}%
\author[3]{Thomas J. Immel}%
\affil[1]{Virginia Polytechnic Institute and State University}%
\affil[2]{George Mason University}%
\affil[3]{University of California, Berkeley}%
\affil[4]{U.S. Naval Research Laboratory}%
\affil[5]{University of California Berkeley}%
\affil[6]{UC Berkeley}%
\affil[7]{Naval Research Laboratory}%


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  \date{May 19, 2024}


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\begin{abstract}
In near-Earth space, variations in thermospheric composition have
important implications for thermosphere-ionosphere coupling. The ratio
of O to N\textsubscript{2} is often measured using far-UV airglow
observations. Taking such airglow observations from space, looking below
the Earth's limb allows for the total column of O and N\textsubscript{2}
in the ionosphere to be determined. While these observations have
enabled many previous studies, determining the impact of non-migrating
tides on thermospheric composition has proved difficult, owing to a
small contamination of the signal by recombination of ionospheric
O\textsuperscript{+}. New ICON observations of far UV are presented
here, and their general characteristics are shown. Using these, along
with other observations and a global circulation model we show that
under certain circumstances the impact of non-migrating tides on
thermospheric composition can be observed. By comparing the amplitude of
the variation seen with that in the model, both the utility of these
observations and a pathway to enable future studies is shown.%
\end{abstract}%



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