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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The sounder system electronically processes the <br />signals to provide mean winds in digital format. <br />could be printed at the unit, but were also written <br />magnetic tape for later computer analysis. <br /> <br />reflected <br />The data <br />to 9 track <br /> <br />Because of the site location, interference from nearby <br />trees or very high winds caused fairly frequent loss of data <br />during some of the storm periods. Local interference almost <br />always affected the quality of the data in the lowest 200 <br />meters but the data at most of the levels above 200 meters <br />were usually recovered. Only a small portion (12 days) of <br />the data collected has been edited into a "clean" format. <br />This reduction was done for some of the weather episodes which <br />were considered to be of more interest. <br /> <br />Like most of the other systems at Happy Jack the acoustical <br />sounder began operation in mid-January (January 15) and ran <br />until March 17. At intervals during the field program, the <br />enclosures that house the antenna required removal of snow <br />that would accumulate within them. At these times (usually <br />less than one hour) the system was inoperative. Otherwise, <br />wind data were routinely collected from the instrument during <br />clear weather periods as well as in storm conditions. <br /> <br />1 <br />I <br /> <br />2.4.5 <br /> <br />Ice Particle Imaqing Probes <br /> <br />I <br /> <br />A ground-based aspirated PMS (Particle Measuring Systems) <br />2D-C particle imaging probe was installed and operated at <br />the Happy Jack site. The system produces two-dimensional <br />images of ice particles passing through the laser beam between <br />the probe tips. These are recorded on 9 track magnetic tape <br /> <br />t <br />I <br /> <br />2-14 <br /> <br />I <br /> <br />1 <br />