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<br />!I <br />.II <br /> <br />be grown to detectable sizes. However, a first <br /> <br />approximation for plume position and vertical gra- <br /> <br />dient of concentration will be obtained. If time <br /> <br />permits, additional cross sections will be sampled <br /> <br />at other downwind distances. <br /> <br />Aircraft AgI releases will normally be made across <br /> <br />the prevailing wind in a single line several kilo- <br /> <br />meters long. Then VFR passes will be flown back <br />and forth along the wind at the release level, from <br /> <br />upwi nd to dmmwi nd of the 1 i ne of AgI near its mi d- <br />point. As the line diffuses with time (distance), <br /> <br />sampl ing altiitudes may be varied somewhat to moni- <br /> <br />tor the vertical spreading. Again, pairs of passes <br /> <br />will be used together with the counter delay to <br />estimate the along-the-wind diffusion. It will be <br /> <br />necessary to use the aircraft-measured windspeed <br />in the estimate of horizontal along-the-wind <br /> <br />spreadi ng. <br /> <br />4. Improve understanding of ice particle fonmation, <br />growth and fallout following seeding: <br /> <br />Another major area of uncertainty regarding winter <br /> <br />orographic weather modification is the nucleation, <br /> <br />growth and fallout of the ice particles caused by <br /> <br />seeding, and "their mode of growth {diffusion, <br /> <br />7 <br />