SECTION 1. PREPARATION AND SITING
1-6
1.4.1 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 world wide web at
http://nssdc.gsfc.nasa.gov/space/cgm/cgm.html
If you know the latitude and longitude of your
site, fill out Form 1as shown below for an
accurate magnetic declination. 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.
Query Form 1: Latitude/Longitude
Latitude/Longitude below specified in:
Geographic
Year (from 1945 to 2000): 1998
Altitude above Earth's surface (km) [from 0.
to 40000.]: 0
Latitude (degrees) [from -90.00 to 90.00]:
42.03
Longitude (degrees) [from 0.00 to 360.00]:
248.15
Query Form 2: Image Map
Year (from 1945 to 2000): 1998
Altitude above Earth's surface (km)
[0. - 40000.]: 0
Click on map to specify location and submit:
(select area on map provided)
A table containing similar information to the
following will be returned after submitting Forms
1 or 2.
Geographic
Alt.
CGM
IGRF Magnetic Field
Dipole
Lat.
Long.
(km)
Lat.
Long.
H(nT)
D(deg)
Z(nt)
Lat.
Long.
42.03
248.15
0.
49.80
311.06
20608.
14.417
50505.
49.68
312.14
Содержание UT30
Страница 1: ...UT30 WEATHER STATION INSTALLATION MANUAL REVISED 4 98 COPYRIGHT c 1993 1998 CAMPBELL SCIENTIFIC INC ...
Страница 27: ...SECTION 3 INSTRUMENTATION INTALLATION 3 8 FIGURE 3 3 5 SRM 5A Wiring Computer Datalogger ...
Страница 32: ...SECTION 3 INSTRUMENTATION INSTALLATION 3 13 FIGURE 3 3 9 MD9 Multidrop Interface at the Computer ...