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http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso |
GCMD Feedback Form |
Have a Comment for the GCMD? |
information |
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GCMD Keyword Page |
http://gcmd.nasa.gov/learn/keyword_list.html |
GCMD Keywords Page |
This page describes the NASA GCMD Keywords, how to reference those keywords and provides
download instructions.
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information |
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http://ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml |
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http://ngdc.noaa.gov/geomag/WMM/data/WMM2010/WMM2010_Report.pdf |
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http://ngdc.noaa.gov/wmmsurvey/magneticSurvey.do?plang=c |
WMM2010LegacyC.zip |
World Magnetic Model (WMM2010) with C source code and executables for Windows and
Linux environments.
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download |
| 1 |
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http://ngdc.noaa.gov/wmmsurvey/magneticSurvey.do?plang=f |
WMM2010LegacyFortran.zip |
World Magnetic Model (WMM2010) with Fortran source code and executables for Windows
and Linux environments.
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download |
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http://ngdc.noaa.gov/wmmsurvey/magneticSurvey.do?plang=g |
WMM2010GUI.zip |
World Magnetic Model (WMM2010) with Stand-alone Graphical User Interface (GUI) for
Windows and C source code.
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download |
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http://ngdc.noaa.gov/wmmsurvey/magneticSurvey.do?plang=l |
WMM2010_Linux.tar.zip |
World Magnetic Model (WMM2010) with new C software and executables for Linux environment. |
download |
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http://ngdc.noaa.gov/wmmsurvey/magneticSurvey.do?plang=w |
WMM2010_Windows.zip |
World Magnetic Model (WMM2010) with the new C software and executables for Windows
environment.
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download |
| 1 |
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http://op.gfz-potsdam.de/champ/ |
The CHAMP Mission |
Webpage provided details on equipment, mission, as well as results and publications
associated with the CHAMP mission.
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information |
| 1 |
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http://web.dmi.dk/projects/oersted/ |
The Orsted Satellite Project |
Webpage provided details on equipment, mission, as well as results and publications
associated with the Orsted satellite mission.
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information |
| 1 |
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http://www.epsg-registry.org/ |
European Petroleum Survey Group Geodetic Parameter Registry |
Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured
dataset of Coordinate Reference Systems and Coordinate Transformations.
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search |
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http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4326 |
WGS 84 |
GML of World Geodetic System 1984 coordinate reference system. |
information |
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http://www.intermagnet.org |
INTERMAGNET Program |
Website provides information on participating institutions, observatory locations,
and publications associated with the network of observatories.
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information |
| 1 |
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Measurements during daytime and during periods of strong solar activity
are contaminated by external current systems, which are difficult to accurately model.
Therefore, only nighttime data during magnetically quiet periods were used in estimating
the WMM coefficients.
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Some contributions to the measured magnetic field, such as the diamagnetic
effect of ionospheric plasma (L?hr et al, 2003) or motional induction by tidal ocean
currents (Kuvshinov and Olsen, 2005; Maus, 2007), can be accurately modeled and were
corrected for prior to the estimation of the WMM main field coefficients.
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To account for the contributions that have not been removed in the
previous steps, an extended set of model parameters is co-estimated with the WMM model
coefficients. These account for smaller-wavelength internal magnetic field contributions
(spherical harmonic degree larger than 12), second time derivatives (secular acceleration)
and contributions from currents external to the Earth. The set of WMM coefficients
plus the extended model parameters is called a parent model of the WMM. Two different
parent models were produced, reflecting different modeling strategies employed by
NGDC for the main field model and BGS for the secular variation model.
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