International Geomagnetic Reference Field
E651434
The International Geomagnetic Reference Field is a standardized mathematical model describing Earth’s main magnetic field and its secular variation, used globally for navigation, geophysical research, and defining geomagnetic coordinates.
All labels observed (3)
| Label | Occurrences |
|---|---|
| International Geomagnetic Reference Field canonical | 3 |
| IGRF | 1 |
| World Magnetic Model | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7253135 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: International Geomagnetic Reference Field Context triple: [Magnetic South Pole, isDefinedRelativeTo, International Geomagnetic Reference Field]
-
A.
Gauss–Matuyama geomagnetic reversal
The Gauss–Matuyama geomagnetic reversal was a major event in Earth's history when the planet's magnetic field flipped polarity around 2.6 million years ago, marking a key boundary used in geological time scales.
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B.
Parker spiral model of the interplanetary magnetic field
The Parker spiral model of the interplanetary magnetic field describes how the Sun’s rotating, magnetized solar wind stretches the solar magnetic field into an Archimedean spiral shape throughout the heliosphere.
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C.
Earth gravity model
The Earth gravity model is a mathematical representation of Earth's gravitational field used for precise positioning, navigation, and geodetic calculations.
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D.
Earth Orientation Parameters
Earth Orientation Parameters are a set of time-varying values that precisely describe the irregular rotation and orientation of the Earth in space for applications like navigation, astronomy, and geodesy.
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E.
International Celestial Reference System
The International Celestial Reference System is the standard, high-precision coordinate framework used in astronomy and geodesy to define positions of celestial objects relative to distant quasars.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: International Geomagnetic Reference Field Target entity description: The International Geomagnetic Reference Field is a standardized mathematical model describing Earth’s main magnetic field and its secular variation, used globally for navigation, geophysical research, and defining geomagnetic coordinates.
-
A.
Gauss–Matuyama geomagnetic reversal
The Gauss–Matuyama geomagnetic reversal was a major event in Earth's history when the planet's magnetic field flipped polarity around 2.6 million years ago, marking a key boundary used in geological time scales.
-
B.
Parker spiral model of the interplanetary magnetic field
The Parker spiral model of the interplanetary magnetic field describes how the Sun’s rotating, magnetized solar wind stretches the solar magnetic field into an Archimedean spiral shape throughout the heliosphere.
-
C.
Earth gravity model
The Earth gravity model is a mathematical representation of Earth's gravitational field used for precise positioning, navigation, and geodetic calculations.
-
D.
Earth Orientation Parameters
Earth Orientation Parameters are a set of time-varying values that precisely describe the irregular rotation and orientation of the Earth in space for applications like navigation, astronomy, and geodesy.
-
E.
International Celestial Reference System
The International Celestial Reference System is the standard, high-precision coordinate framework used in astronomy and geodesy to define positions of celestial objects relative to distant quasars.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
geomagnetic field model
ⓘ
mathematical model ⓘ scientific standard ⓘ |
| abbreviation |
IGRF
ⓘ
linked to:
International Geomagnetic Reference Field
|
| applicationDomain |
aeronautics
ⓘ
geodesy ⓘ geomagnetism ⓘ marine navigation ⓘ space weather ⓘ |
| assumes |
no electric currents in modeling region
ⓘ
potential field outside Earth’s core ⓘ |
| coordinateSystem | geocentric spherical harmonic representation ⓘ |
| dataSources |
magnetic observatories
ⓘ
marine and aeromagnetic surveys ⓘ satellite magnetic measurements ⓘ |
| describes |
Earth’s main magnetic field
ⓘ
secular variation of Earth’s magnetic field ⓘ |
| doesNotModel | external magnetic field sources ⓘ |
| doesNotModel | small-scale crustal magnetic anomalies ⓘ |
| epochInterval | 5 years ⓘ |
| firstEpochYear | 1965 ⓘ |
| governingBody | International Association of Geomagnetism and Aeronomy ⓘ |
| latestVersionPublisher | International Association of Geomagnetism and Aeronomy ⓘ |
| mathematicalForm | spherical harmonic expansion ⓘ |
| models | internal part of Earth’s magnetic field ⓘ |
| parentOrganization | International Union of Geodesy and Geophysics ⓘ |
| provides | Gauss coefficients of Earth’s main field ⓘ |
| referenceFrame | Earth-centered Earth-fixed ⓘ |
| relatedConcept |
World Magnetic Model
ⓘ
linked to:
International Geomagnetic Reference Field
geomagnetic coordinates ⓘ geomagnetic dipole ⓘ |
| sponsor | International Association of Geomagnetism and Aeronomy ⓘ |
| standardizedBy | International Association of Geomagnetism and Aeronomy ⓘ |
| timeDependence |
epoch-based representation
ⓘ
piecewise-linear secular variation model ⓘ |
| updatedBy | IAGA Working Group V-MOD ⓘ |
| updateFrequency | every 5 years ⓘ |
| usedAs | global geomagnetic reference standard ⓘ |
| usedFor |
aeromagnetic survey data reduction
ⓘ
defining geomagnetic coordinates ⓘ geophysical research ⓘ magnetic observatory data interpretation ⓘ navigation ⓘ satellite data analysis ⓘ space physics applications ⓘ |
| validRegion |
Earth’s surface
ⓘ
altitudes up to low Earth orbit ⓘ near-Earth space ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: International Geomagnetic Reference Field Description of subject: The International Geomagnetic Reference Field is a standardized mathematical model describing Earth’s main magnetic field and its secular variation, used globally for navigation, geophysical research, and defining geomagnetic coordinates.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: International Geomagnetic Reference Field
linked to: International Geomagnetic Reference Field