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<br />00068~ <br /> <br />resources available; freedom from uncoordinated seedinF or <br /> <br />large air pollution sources; and expected cloud-type <br /> <br />frequencies. <br /> <br />General Field Research Plan Outline <br />Up to four field areas will be established through local <br />coordination and participation, and will be equipped with <br />instrumentation and cloud seeding and measurement aircraft. <br />Each will be furnished with the following essential equip- <br />ment: a quantitative weather radar, rawinsonde, time-share <br />computer terminal and other National Weather Service data <br />support, and a recording and nonrecording rain gage and <br />other surface instrumentation network. Locally based light <br />aircraft will have silver iodide seeding capabilities both <br />at cloud base and from above, and will have hygroscopic <br />seeding capabilities. Minimum instrumentation on local <br />aircraft will include digitally recorded air temperature, <br />liquid water, dewpoint, updraft indications, altitude, <br />and other aircraft parameters. Ground seeding generators <br />will be included to test and confirm this delivery tech- <br />nique and system. A 10,000- to l5,000-square-mile core <br />area within a total project observation area of some <br />25,000 square miles will constitute each field area. Instru- <br />mentation will be more concentrated in the core area than <br />the rest of the project field area and some instrumentation <br />will be outside the area to measure downwind effects. <br /> <br />33 <br />