WMOD00376

• Contract/Permit #: 14-06-D-5640
• Project Name: Park Range Atmospheric Water Resources Program
• Title: Park Range Atmospheric Water Resources Program - Phase II - Parts A and B
• Date: 10/6/1967
• Weather Modification - Doc Type: Report

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of ice nuclei recorded aboard the tracking aircraft were higher tha.n those
measured during a previous run with the two Skyfire hi-output generators.
Since the calibration of the IPA system at Colorado State University indicated
a higher specific productivity for the IPA system than for the hi-output genera-
tor (1015 nuclei/gram vs. 3 x 1014 nuclei/gram at _200C) the result is not

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unexpected, with equivalent AgI consumptions in the two generator types.

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But certain safety precautions must be taken when usin.g the IPA ge-
nerator. The low vapor pressure and chernical composition of IPA combine
to create a very strong ammonia odor which is present when igniting the bur-
ner, and, to a lesser extent, during operation. During ignition, drops of
raw solution are sprayed out and can cause skin burns and injury to the eye s
if personnel are not adequately protected.

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WELL'S GENERATOR

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A Skyfire airborne generator (Fuquay, 1960), modified for ground
use, was demonstrated on Emerald Mountain by Mr. H. J. Wells of ESSA,
during the summer of FY67. This type of AgI-acetone generator can be
controlled remotely, and its output is estimated to be one order of n"lagnitude
greater (in terms of nuclei/second) than that of the Skyfire hi-output genera-
tor. It~ s specific productivity has not been determined, but is probably of
14
the order of 10 / gram.

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REFERENCES

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Fuquay, D. M. and R. G. Baughman, 1962: Project Skyfire Lightning
Research, Final Report to N. S.. F., Grant number NSF-G-l0309,

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December.

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Steele, R. L. 1966: Preliminary investigation of a new generator for silver
iodide using isopropylamine as the carrier, Atmos. Science Tech.,
Paper 76, Colorado State University, Ft. Collins, Colorado
Fuquay, D. M. 1960: Generator technology for cloud seeding, Jour. Irrigation
and Drainage Division, Proc. Am. Soc. , Civil Engr. 86:79-91

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