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• W1991129720 endingPage "692" @default.
• W1991129720 startingPage "633" @default.
• W1991129720 abstract "Laboratory studies of ionization and excitation of atmospheric gases in collisions with 0.1‐ to 1000‐kev protons and hydrogen atoms are reviewed. Recent measurements of the mixed flux of H + and H that penetrates the auroral zone atmosphere during a hydrogen aurora indicate that particles with energies less than 10 kev are most important, which implies that energetic hydrogen atoms cause most of the observed ionization and light emission. Both H + and H produce free electrons by collisional ionization of atmospheric constituents, and stripping of energetic H is an additional source of electrons. Reliable data are available for the cross section for production of electrons in collisions of H + and H with all important target gases, except atomic oxygen, over the full range of auroral energies. Excitation of atmospheric gases has been widely studied for H + collisions in the range above 10 kev, but cross sections for H + below 10 kev and H in any energy range are still largely unknown. Data are available for calculation of expected auroral emissions in the υ′ = 0 bands of the N 2 + first negative system and in the υ′ = 0 bands of the N 2 second positive system. The ratio of the cross section for electron production by ionization to the cross section for emission of the 391.4‐nm band of the N 2 + first negative system is found to be about 20 for energies above 10 kev and then to rise to more than 100 at 1 kev. In the case of the hydrogen emissions, laboratory data are adequate for auroral calculations of Lyman α radiation. Collisional excitation of energetic H to the 2 p level, rather than charge transfer excitation involving fast H + , is the major source of Lyman α in the hydrogen aurora. Data on the production of the Balmer α line are lacking at energies below 10 kev. The available Balmer α data suggest a broad peak near 10 kev in the effective auroral cross section that is nearly an order of magnitude smaller than the peak in the Lyman α cross section, which occurs at energies less than or equal to 1 kev. Insufficient laboratory data exist for meaningful calculations of auroral H β intensities." @default.
• W1991129720 created "2016-06-24" @default.
• W1991129720 creator A5018090085 @default.
• W1991129720 creator A5070723943 @default.
• W1991129720 date "1973-08-01" @default.
• W1991129720 modified "2023-09-27" @default.
• W1991129720 title "Laboratory studies of collisions of energetic H⁺and hydrogen with atmospheric constituents" @default.
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