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<br />I <br /> <br />I <br /> <br />Tl <br /> <br />TZ <br /> <br />T3 <br /> <br />I <br /> <br />1 cycle Ihour <br />nucleation f- - - - - - - . <br /> <br />unknown <br />atmospheric <br /> <br />transfer function <br /> <br />----- .... <br /> <br />precipitation- <br />rate data <br /> <br />I <br /> <br />I <br /> <br />Known <br /> <br />Postulated to be <br />quasi-linear with air <br />transport <br /> <br />Known <br /> <br />I <br /> <br />I <br /> <br />Determine precipitation augmentation by analyzing T 3 for T 1 component, <br />assuming T 2 to contribute only a time shift <br /> <br />I <br /> <br />Figure 4. Analysis Approach <br /> <br />I <br /> <br />and surrounding areas, What we don't know is the transfer function between <br />the nucleation operation and the measurement of precipitation- rate. If it is <br />highly non-linear, time varying operation, it would be very difficult to sup- <br />pose that one could pick out a periodically applied signal in the resulting pre- <br />cipitation-rate. On the other hand, we are fairly certain from the results of <br />our diffusion measurements that -- on the average -- the nuclei will be trans- <br />ported from the nucleating site to the target area along the vector of the mean <br />11,000 feet MSL wind and with a velocity very close to that of the wind at that <br />altitude. We do not know precisely the spread of the plume laterally or ver- <br />tically, nor whether the plume stays as a well-defined element or is broken <br />up into nlany small blobs. More often than not, however, the diffusion mea- <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />surements indicate that the nucleating function will retain its essential char- <br /> <br />acter throughout the transport tiu.e to the target area. <br /> <br />I <br /> <br />While we originally postulated that we could determine the effect of <br />nucleation by simply examining the amplitude of the precipitation- rate power <br />spectrum, our subsequent analysis of Phase I data indicated that the coher- <br /> <br />I <br /> <br />I <br /> <br />ence - a derivative of the power specU'um - between the forcing function and <br /> <br />the precipitation- rate was a much more sensitive indication of an effect. <br /> <br />I <br /> <br />- 7 - <br />