WS-PRO2 Weather Station Manual
GT
27176
Page 12 of 61
the declination for Logan, Utah is 13.80° East. True North is 360°- 13.80°
or 346.2° as read on a compass.
Note
: Other methods employ observations using the North Star or the
sun, and are discussed in the Quality Assurance Handbook for Air
Pollution Measurement Systems, Volume IV - Meteorological
Measurements4.
Figure 5
2.1.7 NSSDC CGM Service
The NSSDC CGM (Corrected Geomagnetic) Service provides an easy
way of determining magnetic declination of a specific site. Since magnetic
declination fluctuates with time, it should be determined each time the
wind vane orientation is adjusted. It can be accessed on the internet at:
http://nssdc.gsfc.nasa.gov/space/cgm/cgm.html
If you know the latitude and longitude of your site, fill out Form 1 for an
accurate magnetic declination. Below is an example for Logan, Utah
U.S.A (Figure 6). If you do not know the latitude and longitude of your
site, fill out Form 2 for estimate of magnetic declination. Note that
longitude is expressed in 0 to 360 degrees east of the Greenwich prime
meridian, and that north latitudes are positive.
A table containing similar information to the following will be returned later
submitting Forms 1 or 2.
Summary of Contents for WS-PRO2
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