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An ellipsoidal harmonic representation of Earth's lithospheric magnetic field to degree
and order 720 |
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CHAMP Satellite Data |
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Enhanced Magnetic Model 2015 |
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doi:10.7289/V56971HV
NCEI Metadata ID: gov.noaa.ngdc.mgg.geophysical_models:EMM2015
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GEODAS magnetic data |
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GCMD Data Center Keywords |
Global Change Master Directory (GCMD) Data Center Keywords |
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GCMD Location Keywords |
Global Change Master Directory (GCMD) Location Keywords |
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GCMD Science Keywords |
Global Change Master Directory (GCMD) Science Keywords |
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INTERMAGNET Observatory Data |
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International DOI Foundation (IDF) |
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NOAA National Centers for Environmental Information |
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ORSTED Satellite Data |
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Swarm Satellite Data |
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WMM2015 Report |
The US/UK World Magnetic Model for 2015-2020 |
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World Geodetic System 1984 |
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http://earth.esa.int/web/guest/swarm/data-access |
Swarm Earth Explorers |
Webpage provided details on equipment, mission, as well as results and publications
associated with the Swarm mission. |
information |
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http://geomag.colorado.edu/images/PublicationsPDFs/ngdc720.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 |
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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 |
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http://www.space.dtu.dk/english/Research/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 |
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https://epsg.org/crs_4326/WGS-84.html |
WGS 84 |
GML of World Geodetic System 1984 coordinate reference system. |
information |
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https://epsg.org/home.html |
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. |
search |
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https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords |
Global Change Master Directory (GCMD) Keywords |
The information provided on this page seeks to define how the GCMD Keywords are structured,
used and accessed. It also provides information on how users can participate in the
further development of the keywords. |
information |
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https://www.ncei.noaa.gov/contact |
NCEI Contact Information |
Information for contacts at NCEI. |
information |
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https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ngdc.mgg.geophysical_models:EMM2015/html |
Metadata Landing Page |
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information |
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https://www.ngdc.noaa.gov/geomag/EMM/EMMSurveySPH.shtml |
EMM2015_Sph_Linux.zip |
Enhanced Magnetic Model (EMM2015) and software using the spherical harmonic approach
for Linux environments. High CPU requirements (use the faster Mesh software for large
number of points), very low RAM requirement. For use with years 2000 to 2020. |
download |
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https://www.ngdc.noaa.gov/geomag/EMM/index.html |
EMM Home Page |
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information |
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https://www.ngdc.noaa.gov/geomag/WMM/data/WMM2015/WMM2015_Report.pdf |
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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 (Lühr 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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2015-04-22T00:00:00 |
NOAA created the National Centers for Environmental Information (NCEI) by merging
NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC),
and National Oceanographic Data Center (NODC), including the National Coastal Data
Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations
Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
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