The Research on NmF2 and TEC Derived from Nighttime Oi 135.6nm Emission Measurement

Abstract:

Measuring the nighttime OI 135.6nm airglow emissions for the study of ionosphere changes has been used as one of the most common ways to detect ionosphere at present. The sensor of measuring the nighttime OI 135.6nm airglow emissions for obtaining the total electron content and peak electron densitywill be been on board the FY-3 meteorological satellite of China. Because of few far-ultraviolet airglow radiative research in our Country,the associated airglow emitting models and the retrieval algorithm studyare imperative. Based on the nighttime OI 135.6nm airglow excitation mechanism research, considering the radiative scattering of the atmospheric oxygen atoms and absorption of oxygen molecules at the band at the radiative transfer process ,the iterative method was used to solve the radiative transfer equation including multiple scattering and the atmospheric absorption attenuation. The volume emissive rates at the band could been obtained.Furthermore the radiative intensity was calculated by the path integral calculation of radiative transfer at 135.6nm band. Analysis of the results shows that the airglow model could be used to describe the volumeemissive rates with height distribution well. The 135.6nm radiative intensities calculated at different spatial temporal distribution and solar activity conditions have a good consistency with NmF2 and TEC. Under the same conditions of spatial temporal and solar activity input conditions, the radiative intensity calculated by the model was compared with similar foreign model and the mean deviation was 3%,and further confirms the correctness of the model.This paper finally introducedthe retrieval algorithmof NmF2 and TEC by measuring the nighttime OI 135.6nm airglow emissions.