Ground Cloud Dispersion Measurements During The Titan IV Mission No. K15 (5 December 1995) at Vandenberg Air Force Base. Volume 2 - Further Analysis of Quantitative Imagery and of Aircraft HCl Data

摘要

The atmospheric dispersion Model Validation Program (MVP) collects and distributes launch cloud dispersion and transport data for the launch community. A previous report provided an overview and data summary for launch cloud measurements associated with the Titan IV Mission Number K15 launch (5 December 1993). This report presents a more detailed analysis, both for the aircraft HCl measurements and for the quantitative imagery. This analysis includes a comparison, at one-min resolution, of the aircraft's HCl sampling data with the results of simultaneous quantitative imagery. The combined data provide a three- dimensional perspective of the solid rocket motor exhaust cloud for the first 11 min after launch. In addition, this report provides a detailed graphical plotting of the aircraft's HCl measurements and maps the HCl concentrations both in time and in space. Comparisons reveal that both REEDM version 7.07 and version 7.08 predict lower-than-measured HCl concentrations at the predicted stabilization height. These aircraft data document fragmentation of the cloud into separate parcels and slower-than-expected dispersion of these portions of the ground cloud. The imagery data documented the rise and stabilization of the cloud during the first 11 min after launch. These data are useful for quantifying the accuracy of the Rocket Exhaust Effluent Diffusion Model (REEDM) as it is tuned for better agreement with measured cloud characteristics.