This table summarizes the sonic and prop vane azimuths. Azimuth angles were shot relative to magnetic north with the datascope.
date | stn | whom | sonic (measured,magnetic) | sonic Vazimuth (calculated,true) | prop (measured,magnetic) | prop azimuth (calc,true) | notes |
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6/29 | 1 | Kurt, Rus | 356.3, 356.7 | 267.8 | 92.3, 92.6 | 273.8 |
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6/24 | 2 | Gordon, Dan | 357.0 | 268.3 | 93.3 | 274.6 | |
6/29 | 2 | Kurt | 357.0 | 268.3 | 93.3 | 274.6 | good agreement with 6/24 |
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6/29 | 3 | Kurt | 353.0 | 264.3 | 93.2 | 274.5 |
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6/24 | 4 | Gordon, Dan | 354.3 | 265.6 | 92.6 | 273.9 | |
6/29 | 4 | Kurt | 353.5 | 264.8 | 88.9 | 270.2 | prop disagrees (-3.7 deg) with 6/24 |
7/5 | 4 | Dan, Kris | 354.2 | 265.5 |
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Magnetic declination = 1.3 deg E
sonic: Vazimuth = magnetic measured + declination - 90
Vazimuth is the direction that the sonic V axis is pointing, and is the rotation angle of horizontal wind components from instrument to geographic coordinates.
prop: azimuth = magnetic + 180 + 1.3measured + declination + 180
prop azimuth is the angle that is added to the wind directions measured by the propvane, so that they are relative to true north.