Reactions in the ionosphere

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Abstract
The ion chemistry of the E and F layers depends on a few ion-neutral reactions, with NO+ as the terminating ion, and on dissociative recombination. In the topside ionosphere the main source and sink of the H+ ions is the reversible charge transfer process H+ O+ ⇆ H+ + O; the He+ ions are formed by the action of solar radiation and are neutralized in dissociative charge transfer collisions with nitrogen molecules. The metallic positive ions present in sporadic E and in the D region result from photoionization and charge transfer. It is not certain how they recombine. Positive ions in the middle and lower part of the D region take part in a sequence leeding to the hydrated protons H3O+(H2O)n observed. Negative ions are here important but little can be said with asurance about their nature.

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