D- AND E-REGION EFFECTS Jeffrey M. Forbes Space Data Analysis Laboratory, Boston College, Chestnut Hill, MA 02167 A time-dependent analytic formalism is utilized to examine the competing effects of transport, photodissociation, and frequency of injection on the steady-state global distribution of HLLV second-stage discharges of H2O, and to estimate concomitant effects on the ion chemistries of the D- and E-regions. For details of the following presentation, see Forbes (1980). The model assumes the 70-120 Km height range to be a slab, or closed system; in other words, diffusion of H2O to above 120 Km or below 70 Km is prohibited. This simplifying assumption can be crudely justified by noting the slow vertical diffusion velocity near 70 Km and the short photochemical halflife of H2O compared to the diffusive residence time near 120 Km (see Forbes (1980)). In slab model the equation governing the height-integrated number density of H2O is
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