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http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso |
GCMD Feedback Form |
Have a Comment for the GCMD? |
information |
| 3 |
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://geomag.org/info/Smaus/Doc/ngdc720.pdf |
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http://ngdc.noaa.gov/geomag/WMM/data/WMM2010/WMM2010_Report.pdf |
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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.
|
information |
| 1 |
|
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.
|
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 |
| 1 |
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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 |
| 1 |
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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.
|
information |
| 1 |
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http://www.ngdc.noaa.gov/geomag/EMM/EMMSurvey2006.shtml |
EMM-06.tar.gz |
Software for the Enhanced Magnetic Model (EMM-06), including main field, secular variation,
NGDC-720-V1 crustal field, magnetospheric field, and induced field. The package includes
a simple single-point program and a thread-safe multi-processor application which
can be adapted to produce large grids and time series.
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download |
| 1 |
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http://www.ngdc.noaa.gov/geomag/EMM/EMMSurvey2009.shtml |
EMM2010_Dec-15-09.zip |
Enhanced Magnetic Model (EMM2010) with software for point and grid calculation. |
download |
| 1 |
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http://www.ngdc.noaa.gov/geomag/EMM/EMMSurveyMesh.shtml |
EMM2010_Mesh_Windows_Linux.zip |
Enhanced Magnetic Model (EMM2010) with software with rapid field calculation using
3D mesh interpolation for Windows and Linux environments. Low CPU requirements, High
(1.4 GB) RAM requirement. Only works for years 2010-2015, for 2000-2010 please download
the spherical harmonic version above.
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download |
| 1 |
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http://www.ngdc.noaa.gov/geomag/EMM/EMMSurveySPH.shtml |
EMM2010_Sph_Windows_Linux.zip |
Enhanced Magnetic Model (EMM2010) and software using the spherical harmonic approach
for Windows and Linux environments. High CPU requirements (use the faster Mesh software
for large number of points), very low RAM requirement (7.5 MB). For use with years
2000 to 2015.
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download |
| 1 |
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http://www.ngdc.noaa.gov/geomag/EMM/EMMSurveyV3p0.shtml |
EMM-720_V3p0.tar.gz |
Enhanced Magnetic Model with software for rapid field calculation using 3D mesh interpolation. |
download |
| 1 |
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http://www.ngdc.noaa.gov/geomag/EMM/data/geomag/EMM-720_V3p0_secvar.cof.gz |
EMM-720_V3p0_secvar.cof.gz |
Enhanced Magnetic Model. Spherical Harmonic Coefficients of the estimated secular
variation 2010-2015.
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download |
| 1 |
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http://www.ngdc.noaa.gov/geomag/EMM/data/geomag/EMM-720_V3p0_static.cof.gz |
EMM-720_V3p0_static.cof.gz |
Enhanced Magnetic Model. Spherical Harmonic Coefficients of the static internal field
at 2010.0.
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download |
| 1 |
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http://www.ngdc.noaa.gov/geomag/EMM/index.html |
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| 1 |
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EMM-06.tar.gz |
3 |
Software for the Enhanced Magnetic Model (EMM-06), including main field, secular variation,
NGDC-720-V1 crustal field, magnetospheric field, and induced field. The package includes
a simple single-point program and a thread-safe multi-processor application which
can be adapted to produce large grids and time series.
|
| 1 |
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EMM-720_V3p0.tar.gz |
3 |
Enhanced Magnetic Model with software for rapid field calculation using 3D mesh interpolation. |
| 1 |
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EMM-720_V3p0_secvar.cof.gz |
3 |
Enhanced Magnetic Model. Spherical Harmonic Coefficients of the estimated secular
variation 2010-2015.
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| 1 |
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EMM-720_V3p0_static.cof.gz |
3 |
Enhanced Magnetic Model. Spherical Harmonic Coefficients of the static internal field
at 2010.0.
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| 1 |
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EMM2010_Dec-15-09.zip |
1 |
Enhanced Magnetic Model (EMM2010) with software for point and grid calculation. |
| 1 |
|
EMM2010_Mesh_Windows_Linux.zip |
3 |
Enhanced Magnetic Model (EMM2010) with software with rapid field calculation using
3D mesh interpolation for Windows and Linux environments. Low CPU requirements, High
(1.4 GB) RAM requirement. Only works for years 2010-2015, for 2000-2010 please download
the spherical harmonic version above.
|
| 1 |
|
EMM2010_Sph_Windows_Linux.zip |
4 |
Enhanced Magnetic Model (EMM2010) and software using the spherical harmonic approach
for Windows and Linux environments. High CPU requirements (use the faster Mesh software
for large number of points), very low RAM requirement (7.5 MB). For use with years
2000 to 2015.
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| 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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Satellite, marine, and aeromagnetic measurements were compiled into
an ellipsoidal degree-720 magnetic model of the Earth's lithosphere. This model accurately
represents the crustal field down to wavelengths of approximately 56 kilometers. This
results in a higher pointing accuracy.
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