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<br />, <br />,. . <br /> <br /> <br />..... i <br /> <br />. <br /> <br />~ <br /> <br />,... <br /> <br />-- - <br /> <br />'" <br /> <br />. <br />~.1 <br /> <br />~,,~ <br /> <br />.- <br /> <br />. <br /> <br />Figure 2.7.. Typical precipitation gauge sile showing shielded gauge and GOES antenna. <br /> <br />2.5 SF II Truccr Operations <br /> <br />Sulfur hexafluoride (SF6J, a nontoxic, nonflammable gas, is a well known tracer used in both <br />weather modification and air pollution studies. The tracer gas trajectory will not exactly <br />match the trajectories of propane-generated ice crystals. However, the tracer will indicate <br />the general direction and dispersion patterns of the treated volume of air passing by the <br />dispenser. SFti studies conducted during the 1991-92 and 1992.93 winter seasons were <br />summarized in the LOREP Annual Reports of Field Activities (Reynolds, 1992b; 1993). The <br />study discussed in section 8 used SFI; data from .January through March 1993. <br /> <br />13 <br />