CONCLUSIONS The huge amount of thermal energy contained m the exhaust of the proposed HLLV would in some situations induce a saturated, wet convective cloud or enhance an existing convective activity. The degree and duration of these effects depend upon the ambient meteorological conditions. Generally, the effects would be more pronounced in potentially unstable air, which is conducive to natural cloud formation. Nevertheless, the effects would be limited to the general area of the launch site. The observed long-lasting high concentrations of cloud condensation nuclei produced during and after a rocket launch may appreciably affect the frequency of occurrence and persistence of fogs and haze. In view of the high mission frequency proposed for the SPS vehicle launches, a potential exists for a cumulative effect. More studies are needed in this regard. REFERENCES 1. Hindman, E.E. II, and L.F. Radke, ''Cloud Nuclei from Launches of Liquid and Solid Fueled Rockets," Extended Abstracts 7th Conference on Inadvertent and Planned Weather Modification, Oct. 8-12, 1979, American Meteor. Soc., pp. 18-19. 2. Parungo, F.P., and P.A. Allee, "Rocket Effluent - It's Ice Nucleation Activity and Related Properties," J. Appl, Meteor., 17, 1856-1863 (1978). 3. Bollay, E., et al., "Position Paper on the Potential of Inadvertent Weather Modification of the Florida Peninsula Resulting from Neutralization of Space Shuttle Solid Rocket Booster Exhaust Clouds," Insitute on Man and Science, Rensselaerville, NY, NASA Contractor Report 3091, Nov. 1979. Fig. 1. Basic Sounding for 1936 EST 13 December 1978, CAPE CANAVERAL, Florida
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