H2 fluorescence spectrum from 1200 to 1700 A by electron impact - Laboratory study and application to Jovian aurora

摘要: A combined experimental study of the fluorescence spectrum H_2 at wavelengths 1200-1700 by electron impact and its application to modeling Jovian aurora have been carried out. Our laboratory data suggest that 100 eV relative cross sections for direct excitation Lyɑ, Lyman bands (B^1Σ_u^+-X^1Σ_g^+), Werner bands (C^1π_u-X^1Σ_g^+) are 1, 2.3±0.6, 2.6±0.5, respectively, in conflict with Stone Zipfs (1972) results bands. Cascade from E,F^1Σ_g^+ states contributes an additional 31% B^1Σ_u^+ state population. It is shown most likely fate metastable H(2^2S) atoms produced collisional quenching H(2^2P), this could add as much 60% predicted Lyɑ emission. On basis detailed atmospheric radiative transfer modeling, we conclude recent IUE Voyager observations consistent precipitation electrons energy range 1-30 keV or other energetic particles penetrate number densities 4 X 10^(10)-5 10^(13) cm^(-3) or column 5 10^(17)-2 10^(20) cm^(-2) atmosphere. The globally averaged flux production hydrogen 0.5-2 ergs s^(-1) 1-4 10^(10) s^(-1), respectively.