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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />~ <br />~ <br />. <br />. <br />. <br />. <br />. <br />I <br /> <br />An increase of 104 % in precipitation mass for a control value of 279.9 klon in 7 cases means: <br /> <br />~I = 7 x 1.04 x 279.9 klon = 2 037.7 kton = 1 653 ac.f <br /> <br />In forty small seeded cases the seeding operations were done at the base level. whereas eight seeded <br />clouds were seeded by the top. The comparison of performance between these two sub-samples is <br />shown in table 3 below: <br /> <br />large Clouds <br /> <br />The sub-sample of 7 large seeded clouds received a synergetic analysis. In average. the seeding <br />operations on these large douds affected 50 % of their whole volume: with a perfect liming (100 % of <br />the material went to the douds in their first half-lifetime). A lotal of 28 nares were used in this sub- <br />sample for an effective dose about 45 ice-nuclei per liter. <br /> <br />Also in average. large clouds were about 20 minutes old when the operations took place: the operation <br />lasted about 25 minutes, and the large seeded douds lived 170 minutes. <br /> <br />Table 3 shows the corresponding results: <br /> <br />Table 3: large Seeded Sample versus Virtual Control Sample (7 couples. averages) <br /> <br />Variable Seeded Sample Control Sample Simple Ratio Increases (%) <br />lifetime 170 min 140 min 121 21 <br />Area , , 1.12 12 <br /> 1650 km 1473 km <br />Volume 6565 km.l 5489 km' 1.20 20 <br />Volume 1899 km-1 1415km' 1.34 34 <br />Above 6 km <br />Prec. Flux 16810m-'/s 12794 m lIs 1.31 31 <br />Prec. Mass 86271 kton 63401 kton 1.36 36 <br /> <br />Ar1 increase of 36 %, in precipitation mass for a control value of 63 401 kton in 7 cases may mean: <br /> <br />.1, = 7 x 0.36 x 63 401 kton = 159770.5 kton = 129574 ac-f <br /> <br />Type B Clouds <br /> <br />The sub-sample of 6 type B seeded douds received a synergetic analysis. In average, the seeding <br />operations on these type B douds affected 30 % of their whole volume; with a good timing (64 % of the <br />material went to the douds in their first half-lifetime). A total of 34 flares were used in this sub-sample <br />for an effective dose - 40 ice-nuclei per liter. <br /> <br />Also in average. type B clouds were 75 minutes old when the operahons took place; the operation <br />lasted about 40 minutes, and the type B seeded douds lived 205 minutes. <br /> <br />Table 4 shows the results: <br /> <br />45 <br />