Accession Number : AD0415813

Title :   EFFICIENCY OF METHODS OF PRODUCING ICE CRYSTALS IN SUPERCOOLED CLOUDS,

Corporate Author : OHIO STATE UNIV COLUMBUS

Personal Author(s) : Starr,Leonard Neal

Report Date : JUN 1963

Pagination or Media Count : 35

Abstract : Simutted rockets and a system of collection plates were constructed for use in supercooled fog in an attempt to determine the efficiency of liquid nitrogen and silver iodide in producing ice crystals. An experiment comparing the efficiency of ice nuclei formation of a silver iodide ''warhead'' and silver iodide impregnated gun powder string was also conducted using an ice nuclei counter. Liquid nitrogen is capable of producing ice crystals as long as the temperature of the cloud is below 0 C. The threshold temperature of silver iodide for converting supercooled droplets to ice crystals is -5 C. Supercooled fog with the required -5 C temperature was not encountered during the experiments so that ice crystal data for the silver iodide warhead could not be collected. The number of ice nuclei produced with the silver iodide warhead was significantly greater than the same quantity of silver iodide impregnated gunpowder string when ignited. Liquid nitrogen was effective in producing ice crystals, but considering cost and handling problems, the efficiency is reduced. (Author)

Descriptors :   (*CLOUDS, SUPERCOOLING), (*CRYSTALS, ICE FOG), CRYSTAL GROWTH, CRYSTAL STRUCTURE, SILVER COMPOUNDS, IODIDES, SIMULATION, MICROSCOPY, ROCKETS, CRYSTALLIZATION, NUCLEATION, WARHEADS, MORTARS, METEOROLOGY

Distribution Statement : APPROVED FOR PUBLIC RELEASE