WMOD00377

• Contract/Permit #: 14-06-D-5640
• Project Name: Park Range Atmospheric Water Resources Program
• Title: Park Range Atmospheric Water Resources Program - Phase II - Part A
• Date: 11/15/1966
• Weather Modification - Doc Type: Report

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. 1 1 0 . 1 d'
dlameter and containing approximately 2 x () partlc es per gram was lS-
pensed from 8300 foot Emerald Mountain using a Metronic s Associates Model
5 FP Ae ro sol Generator System, The plume~ was traced by flying the airc raft
with re spect to known landmarks on the ground, The real time sensor unit
used on the aircraft consists of a vacuum source drawing air and particles
into a chamber where particles are activated by the radiation from an ultra-
violet lamp, The particles then go through a light trap into a second chamber
where their phosphore scence is measured by a sensitive photomultiplier tube.
On the last two flights a real time freezing nuclei detector was flown in con-
junction with the ZnS (ktector and silve r iodide particle s released simul-
taneously with the ZnS particle s.

Calibration

The calibration curves for two units installed in the aircraft used in

over half of these tests is presented in Figure 48, These points came from
I basic data of the mass of 2210 pigment collected on a filte r at a known flow
rate and for a known inte rval. No data points we re omitted. Also the out-
I put of the photomultiplier tube is checked periodically with a radioactive
source of known output.

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Tables VIII and IX summarize the tracer releases of Phase II-Part A.

Tests were made on 24 days and termed Daisy VIII through Daisy XXXI. Lo-
cal single-theodolite pibals, radar winds from Mt. Harris and high resolu-
tion wind information from the 45 foot level of Emerald Mountain were avai1-

able, For some flights, a vertical temperature profile was obtained from
a vortex thermometer in the aircraft,

The result of one test is presented in Figure 49; the plots for other
flights will be found in Appendix D, Individual tracks where tracer material
was found are listed giving the time, altitude and length along the track where
signal was found. A subjective estimate of the location and width of the
plume is given, the plume width being defined as that width judged to include

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