Manual

Appendix B. Measurement Names and Meanings
The term,
(( ') ') / Θ
ii
sNS
2
∑
, is 0 if the deviations in speed are not
correlated with the deviation in direction. This assumption has been verified in
tests on wind data by CSI; the Air Resources Laboratory, NOAA, Idaho Falls,
ID; and MERDI, Butte, MT. In these tests, the maximum differences in
σσ ()((')/) ()(( /))
//
ΘΘ Θ uNuU
i
== S −
∑
212 1
21 and
2
have never been greater than a few degrees.
The final form is arrived at by converting from radians to degrees (57.296
degrees/radian).
σ ()(( /)) ( /)
//
Θ uUS US =− =− 21 811
12 12
B-7