Campbell-scientific WINDSONIC 2-D Sonic Wind Sensors Manuel d'utilisateur télécharger pdf (Page 39)

Appendix A. WindSonic Orientation

A.2 Online Magnetic Declination Calculator

The magnetic declination calculator web calculator published by NOAA’s

Geophysical Data Center is available at the following url:

www.ngdc.noaa.gov/geomagmodels/Declination.jsp. After the web page loads,

enter the site zip code, or longitude and latitude, then click on the “Compute

Declination” button (FIGURE A-4).

FIGURE A-4. NOAA web calculator

The declination for Logan, UT is 12.4 degrees (3 June 2010). As shown in

FIGURE A-4, the declination for Utah is positive (east of north), so True North

for this site is 360 – 12.4, or 347.6 degrees. The annual change is ─7

minutes/year or 7 minutes west per year.

A-3

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Campbell-scientific WINDSONIC 2-D Sonic Wind Sensors Manuel d'utilisateur Page 39