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The origin of nitrogen ionization in the upper atmosphere

Authors
Journal
Planetary and Space Science
0032-0633
Publisher
Elsevier
Publication Date
Volume
2
Identifiers
DOI: 10.1016/0032-0633(60)90010-6

Abstract

Abstract Although the N 2 + First Negative bands in twilight are probably the result of resonance scattering by N 2 + ions, the symmetry of morning and evening observations make it unlikely that the ionization is produced by sunlight in the E-region. If the flux in the He II λ304 line is as high as 15 erg cm −2 sec −1, the observed First Negative system intensities can be accounted for, and the nitrogen ionization is localized in the F-region. If the flux in the λ304 line is much smaller, the ionization must be produced by incident charged particles in the E-region.

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