The nighttime ionospheric parameters in the FUV L2.5 v05 data product of the NASA ICON mission contain systematic bias introduced by Tikhonov regularization. Our newly developed algorithm successfully eliminates the systematic bias. The improved inversion results are provided in the link above.

We developed a high-precision empirical model for the solar vacuum ultraviolet (VUV, 0.1 to 200 nm) irradiance received at Earth, Mars, and Venus, based on Fourier transform analysis and least-squares fitting of the long-term observations from the NASA TIMED and MAVEN missions. The Python code for this model is provided in the link above.

The Fengyun-4C satellite, scheduled to launch in 2025, will carry a Multispectral Ultraviolet Spectral Imager (MUSI) to observe airglow emissions in the spectral range of 120-160 nm. To extract the ionospheric peak electron density (nmF2) and total electron content (TEC) from the nighttime OI 135.6 nm emissions observed by MUSI, we developed a lookup table algorithm that can achieve about 3% retrieval accuracy. The model can also be used to analyze the observations from the NASA GOLD mission. The Matlab code for this lookup table algorithm is provided in the link above.