Storm-time variations of atomic nitrogen 149.3 nm emission

<p>Net <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/radiance" title="Learn more about Radiance from ScienceDirect\textquoterights AI-generated Topic Pages">radiances</a> of atomic nitrogen emission line (N-149.3 nm) from the <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/thermosphere" title="Learn more about Thermosphere from ScienceDirect\textquoterights AI-generated Topic Pages">thermosphere</a> are extracted from the FUV spectra observed by TIMED/GUVI on dayside at sunlit latitudes. During <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/magnetic-storms" title="Learn more about Magnetic Storms from ScienceDirect\textquoterights AI-generated Topic Pages">geomagnetic storms</a>, the N-149.3 nm intensity is clearly enhanced in the locations where O/N₂ <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/depletion" title="Learn more about Depletion from ScienceDirect\textquoterights AI-generated Topic Pages">depletion</a> and <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/nitric-oxide" title="Learn more about Nitric Oxide from ScienceDirect\textquoterights AI-generated Topic Pages">nitric oxide</a> (NO) <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/augmentation" title="Learn more about Augmentation from ScienceDirect\textquoterights AI-generated Topic Pages">enhancement</a> 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.</p>