Analysis of line intensity of cloud-to-ground lightning and flux ratio of active galactic nuclei forbidden nebular lines in NII

We discuss our calculations based on collisional radiative model and multispectral line method to analyze spectra of N II in visible range and determine line intensity and flux ratio of spectral lines 476 and 528 nm which have been observed in Cloud-to-Ground lightning spectra. Collisional ionization and excitation rate coefficients are calculated with collisional radiative model and impact of both processes is studied in the N II spectrum. At temperatures of lightning plasma, intensity ratio I_NII528/I_NII476 from collisional-radiative (CR) model and calculated from multispectral line method are discussed. The flux ratio of Active Galactic Nuclei (AGNs) forbidden nebular lines compared with theoretical results calculated by using flexible atomic code (FAC). Energy levels and lifetimes of 2p², 2p3s, 2p3p, 2p3d levels are presented and found extra ordinary lifetime of ³P_1,2 states verify the experimental reasons behind the existence of forbidden nebular lines of AGNs. The comparison of results shows a reasonable agreement with existing calculated and measured data.