(a) large-scale ionospheric plasma depletions, (b) production of massive quantities of atomic hydrogen in the thermosphere, and (c) formation of a persistent ice cloud near the mesopause. The /•'-layer plasma depletion resulting from the main HLLV second-stage bum is less pronounced than the depletion observed after the Skylab launch. This is because the bum is confined to altitudes below 124 km. The computed electron density reduction at the F2 peak amounts to about 30% at night (12 h after launch) and 10% the following day. TABLE A-I THE DOMINANT CHEMICAL REACTIONS
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