1. Pre-Shuttle, large rocket launches. The HEAO-C launch of an Atlas- Centaur scheduled for late August/early September, 1979, is a particularly striking example of thermospheric (Domain B) injection. Questions of condensation and sublimation, airglow, and radio propagation effects near the F- region ionospheric hole could be investigated from this event. 2. Note that most rocket launches terminate their main engine burns in Domain A and thus ample opportunities exist for work in that region addressing the problem of contrails (condensation and sublimation, noctilucent clouds) and D-region electron density reductions. 3. Atmospheric experiments using small rockets. Various "routine" rocket-borne scientific payloads carried by sounding rockets could be used to study vehicle-induced ionospheric disturbances. The small amounts of exhaust involved would limit effects to small-scale and localized phenomena in Domains A and B. 4. Rocket-borne payloads designed to study ionospheric modification effects directly. Such a LAGOPEDO-type experiment is planned by Los Alamos Scientific Laboratory (LASL) for Ft. Churchill, Canada, in March 1980. 5. Early space Shuttle Mission engine burns. These experiments of opportunity offer insertion, circularization, and deorbit burns at low latitudes that are of direct relevance to possible HLLV-induced effects in Domain A and can be scaled to Domain B (note that most parking orbits are at 200-300 km altitude rather than 500 km as for SPS, the latter choice being determined by the high drag of the large SPS arrays of solar panels). It would be particularly valuable to request that mission-required or dedicated engine burns be made over atmospheric observatories. 6. Spacelab-2 type ionospheric modification experiments. Seven OMS engine burns are planned over five ionospheric and radio astronomical observatories as part of the Spacelab-2 mission, which is currently scheduled for January 1982. These will address a full range of ionospheric disturbances capable of being created by rocket emission. 7. AMPS (Atmospheric & Magnetospheric Plasmas in Space), CRM (Chemical Release Module) and "Getaway Special" cannisters can be used to carry out chemical releases from the Space Shuttle for studies of specific atmospheric perturbations. 2.11.5 Airglow (Zinn) Airglow emissions arising from chemical interactions of rocket exhaust products with the ionosphere may be substantial; however, they are unpredictable at the present time. Likely emissions are the red and green oxygen lines at 630, 636.4, and 557.7 nm. If the exhaust gases consist entirely of f^O and H2, then the main reactions producing the 01 emissions are
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