Lidar has been used to track the downwind dispersion of rocket launch contrails and also to determine the particle size
distribution of the primary Al2O3 smoke particles in the contrail. However, the determination of primary particle size from such lidar measurements is complicated by the presence of secondary smoke in the contrail composed of aqueous
hydrochloric acid droplets. In addition, the secondary smoke tends to condense upon the Al2O3 primary smoke particles
in the form of a liquid coating, with the primary smoke particles acting as condensation nuclei. The potential effect of
this liquid coating upon the lidar backscatter return from the rocket contrail is estimated using a standard light scattering
model (BHCOAT) for two-zone core-mantle particles.
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