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 |
|---|---|---|---|---|---|---|---|
6/29 |
1 |
Kurt, Rus |
356.3, 356.7 |
267.8 |
92.3, 92.6 |
273.8 |
|
|
|
|
|
|
|
|
|
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 |
|
|
|
|
|
|
|
|
6/29 |
3 |
Kurt |
353.0 |
264.3 |
93.2 |
274.5 |
|
|
|
|
|
|
|
|
|
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 |
|
|
Magnetic declination = 1.3 deg E
sonic: Vazimuth = 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 = measured + 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.