Campbell Open Path Eddy Covariance System Manuel de l'opérateur télécharger pdf (Page 43)

Appendix A. CSAT3 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

http://www.ngdc.noaa.gov/seg/geomag/jsp/struts/calcDeclination. 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. Online magnetic declination calculator with inputs and

output for Longmont, CO

The declination for Longmont, CO is 9.67 degrees (10 June 2006). As shown

in FIGURE A-4, the declination for Colorado is positive (east of north), so true

north for this site is 360 - 9.67, or 350.33 degrees. The annual change is -8

minutes/year or 8 minutes west per year.

A-3

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Campbell Open Path Eddy Covariance System Manuel de l'opérateur Page 43