## 3 Results
### Variations in Infrared Radiance at NO 5.3 \(\mu\)m
Figure 2: Variation in NO 5.3 \(\upmu\)m radiance values over time in the altitude region of 50–250 km during 18–23 November 2003, measured by TIMED/SABER at about 55\({}^{\circ}\)N 160\({}^{\circ}\)W.  
The two charts presented above show that during the aurora event, the radiance values reach their peak at an altitude range of 100-150 km. This range exhibits a maximum value of 3.38 \(\times\) 10\({}^{-3}\) W/m\({}^{2}\)/sr and a standard deviation of 6.85 \(\times\) 10\({}^{-4}\) W/m\({}^{2}\)/sr, indicating a higher degree of variability in radiance values at these heights. The most significant amplification, however, occurs at altitudes of 200-250 km. During quiet periods, the NO 5.3 \(\upmu\)m radiance values in this range are considerably lower than those at other heights. Following the auroral disturbance, these values increase from 1.89 \(\times\) 10\({}^{-9}\) W/m\({}^{2}\)/sr to 4.54 \(\times\) 10\({}^{-4}\) W/m\({}^{2}\)/sr, exhibiting a difference of approximately five orders of magnitude. Notably, the maximum radiance values between altitudes of 50-200 km are approximately equal. This similarity suggests that the attainable radiance values at their maxima are constrained by temperature and particle concentration-dependent photochemical reactions. Longitudinal and Latitudinal Distribution Characteristics of NO 5.3 \(\upmu\)m Limb Radiance Values at a 120 km Tangent Point Height  
In order to enhance data comparability, we selected 12 orbital measurements from SABER NO 5.3 \(\upmu\)m radiance data taken between 18 and 23 November 2003. These measurements were taken at a tangent point height of 120 km, with a longitude ranging from 60\({}^{\circ}\)W to 160\({}^{\circ}\)W (300\({}^{\circ}\)-200\({}^{\circ}\)) and latitude from 51\({}^{\circ}\)S to 83\({}^{\circ}\)N (-51\({}^{\circ}\)-83\({}^{\circ}\)). The relevant information of the orbital measurements is presented in Table 2. Based on this, we generated a chart illustrating the variation in NO 5.3 \(\upmu\)m radiance value at 120 km as a function of longitude and latitude during auroral disturbances. The chart is shown in Figure 4.  
From Figure 4, it can be observed that the radiance values of NO 5.3 \(\upmu\)m in the quiet state exhibit slight fluctuations (Figure 4a,b). However, after being affected by aurora, there is an increase in radiance values in mid-high latitude regions starting from 13:51 UT on 20 November, as shown in Figure 4c. By around 21:57 UT on 20 November, the radiance values increased to a much higher level, approximately 10 times larger than the quiet state, across the entire longitude and latitude range (Figure 4g). As the disturbance recovered, the radiance values show a decreasing trend from Figure 4h to Figure 4i, and almost returned to the quiet state level by 11:10 UT on 22 November, as shown in Figure 4j. However, as seen in Figure 4k, a slight increase of approximately one order of magnitude is observed in \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Altitude Region (km)**} & \multicolumn{3}{c}{**Statistical Value of Radiance (W/m\({}^{2}\)/sr)**} \\ \cline{2-4}  & **STD** & **MIN** & **MAX** \\ \hline
50–100 & \(3.99\times 10^{-4}\) & \(1.08\times 10^{-4}\) & \(1.79\times 10^{-3}\) \\
100–150 & \(6.85\times 10^{-4}\) & \(3.81\times 10^{-5}\) & \(3.38\times 10^{-3}\) \\
150–200 & \(2.77\times 10^{-4}\) & \(7.28\times 10^{-7}\) & \(2.00\times 10^{-3}\) \\
200–250 & \(6.40\times 10^{-5}\) & \(1.89\times 10^{-9}\) & \(4.54\times 10^{-4}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Statistical analysis of radiance in four altitude regions.