Ionospheric Composition and Reactions
1968; American Association for the Advancement of Science; Volume: 159; Issue: 3814 Linguagem: Inglês
10.1126/science.159.3814.489
ISSN1095-9203
Autores Tópico(s)Solar and Space Plasma Dynamics
ResumoRecent measurements of ion densities in the ionosphere seem to be more or less compatible with current data for ion-molecule reaction rates in some parts of the ionosphere under conditions in which a steady state prevails. There is no such agreement for the upper ionosphere, where the densities of He(+) and H(+) are difficult to understand in terms of present concepts concerning the relevant production and loss processes. Sources of ionizing radiation are needed to explain night- time observations in the E region and perhaps also in the F region. The D region remains a poorly understood laboratory of negative-ion and positiveion chemistry, where neither observation nor theory is as yet adequate.
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