Working Group V-MOD: Geomagnetic Field Modelling

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IGRF-11: Progress reports, candidate models, evaluations and test models

The International Geomagnetic Reference Field (IGRF) is an standard mathematical description of the Earth's internal magnetic field and is used widely in studies of the Earth's deep interior, its crust and its ionosphere and magnetosphere. More information about IGRF and the coefficient for the current release IGRF-11 can be found from IAGA V-MOD IGRF-11 web-page.

This page contains details concerning the development of the update IGRF-11 that took place during late 2009. Candidate models evaluations and test models are presented here.

Deadlines

  • Brief notice of intent to IGRF task force chair: August 15th, 2009
  • For candidate model submissions (including model information): October 1st, 2009
  • For evaluating the candidate models: November 15th, 2009
  • Manuscript submissions to the EPS special issue: November 30th, 2009
  • Publication online of IGRF-11: mid December, 2009

Documents

Candidate models to download (for evaluation)
Candidate models are available in .cof format as specified in the call for IGRF-11. This contains spherical harmonic coefficients in units of nT (or nT/yr for SV) and associated error estimates when supplied by the authors.

A) DTU Space Team, Leader: N. Olsen
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

B) NOAA/NGDC Team, Leader: S. Maus
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

C) BGS Team, Leader: B. Hamilton
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

D) IZMIRAN Team, Leader: V. Golovkov / T. Bondar
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

E) EOST/LPGN/LATMOS/IPGP Team, Leader: A. Chambodut
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

F) IPGP/EOST/LPGN/LATMOS Team, Leader: E. Thebault
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

G) GFZ Team, Leader: V. Lesur
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

H) GSFC/JCET Team, Leader: W. Kuang
Provided only a SV-2010-2015 candidate model:

The International Geomagnetic Reference Field (IGRF) is an standard mathematical description of the Earth's internal magnetic field and is used widely in studies of the Earth's deep interior, its crust and its ionosphere and magnetosphere. More information about IGRF and the coefficient for the current release IGRF-11 can be found from IAGA V-MOD IGRF-11 web-page.

This page contains details concerning the development of the update IGRF-11 that took place during late 2009. Candidate models evaluations and test models are presented here.

Deadlines

  • Brief notice of intent to IGRF task force chair: August 15th, 2009
  • For candidate model submissions (including model information): October 1st, 2009
  • For evaluating the candidate models: November 15th, 2009
  • Manuscript submissions to the EPS special issue: November 30th, 2009
  • Publication online of IGRF-11: mid December, 2009

Documents

Candidate models to download (for evaluation)
Candidate models are available in .cof format as specified in the call for IGRF-11. This contains spherical harmonic coefficients in units of nT (or nT/yr for SV) and associated error estimates when supplied by the authors.

A) DTU Space Team, Leader: N. Olsen
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

B) NOAA/NGDC Team, Leader: S. Maus
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

C) BGS Team, Leader: B. Hamilton
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

D) IZMIRAN Team, Leader: V. Golovkov / T. Bondar
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

E) EOST/LPGN/LATMOS/IPGP Team, Leader: A. Chambodut
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

F) IPGP/EOST/LPGN/LATMOS Team, Leader: E. Thebault
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

G) GFZ Team, Leader: V. Lesur
Provided DGRF-2005, IGRF-2010 and SV-2010-2015 candidate models:

H) GSFC/JCET Team, Leader: W. Kuang
Provided only a SV-2010-2015 candidate model:

Evaluations
Below are the preliminary evaluations of IGRF-11 candidate models carried out by members of the IGRF-11 task force in October/November 2009. They are listed in the order they were submitted. WARNING: these evaluations were not originally written for public use and may contain mistakes- they have not been peer reviewed! They are simply the preliminary evaluations carried out prior to the decisions made by the IGRF-11 task force on the weighting of the candidates models to produce IGRF-11 in December 2009. For a more definitive analysis the evaluation paper by Finlay et al. (2010) to appear in a special issue of EPS should be consulted. The preliminary evaluations are available here in .pdf form and may be downloaded by clicking on the links given.


Test SV models
Test SV models are also available for analysis. The spherical harmonic truncation degree and the number of decimal places retained in these test models was left for the teams to decide. Some teams have also provided more than one test model, some provided no test models. Spherical harmonic coefficients in units of nT/yr together with error estimates where available are given in the files below in the usual .cof format. It is anticpated that these test models will be useful for evaluating future changes to IGRF, but they were not used in the derivation of IGRF-11.

Test models produced by robust weighting scheme
Test models derived using the robust weighting scheme proposed by Nils Olsen are also available for analysis. It is again anticpated that these test models will be useful for evaluating future changes to IGRF, but they were not used in the derivation of IGRF-11.

Evaluations
Below are the preliminary evaluations of IGRF-11 candidate models carried out by members of the IGRF-11 task force in October/November 2009. They are listed in the order they were submitted. WARNING: these evaluations were not originally written for public use and may contain mistakes- they have not been peer reviewed! They are simply the preliminary evaluations carried out prior to the decisions made by the IGRF-11 task force on the weighting of the candidates models to produce IGRF-11 in December 2009. For a more definitive analysis the evaluation paper by Finlay et al. (2010) to appear in a special issue of EPS should be consulted. The preliminary evaluations are available here in .pdf form and may be downloaded by clicking on the links given.

Test SV models
Test SV models are also available for analysis. The spherical harmonic truncation degree and the number of decimal places retained in these test models was left for the teams to decide. Some teams have also provided more than one test model, some provided no test models. Spherical harmonic coefficients in units of nT/yr together with error estimates where available are given in the files below in the usual .cof format. It is anticpated that these test models will be useful for evaluating future changes to IGRF, but they were not used in the derivation of IGRF-11.

Test models produced by robust weighting scheme
Test models derived using the robust weighting scheme proposed by Nils Olsen are also available for analysis. It is again anticpated that these test models will be useful for evaluating future changes to IGRF, but they were not used in the derivation of IGRF-11.

For page content questions please contact: Christopher Finlay
Webpage Maintained by: NCEI

URL: https://www.ngdc.noaa.gov/IAGA/vmod/candidatemodels.html
Revised: 07 November, 2016


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