Current Models
Model  Description  Source  Date 

HDGM2023

The High Definition Geomagnetic Model (HDGM) is a global, high resolution model (degree 720) of the Earth's geomagnetic main and crustal field, providing magnetic field values (total field, dip, and declination) at any point above or below the Earth's surface. An optional addition to HDGM is the HDGMRT, which includes a model of Earth's magnetosphere which provides near realtime estimates of the external disturbance field due to the solar wind. It also contains a magnetic field model of the daily variations due to the ionospheric current systems. 
Core +Magnetosphere +Ionosphere +Crust  
HDGM2023RT

The High Definition Geomagnetic Model (HDGM) is a global, high resolution model (degree 720) of the Earth's geomagnetic main and crustal field, providing magnetic field values (total field, dip, and declination) at any point above or below the Earth's surface. An optional addition to HDGM is the HDGMRT, which includes a model of Earth's magnetosphere which provides near realtime estimates of the external disturbance field due to the solar wind. It also contains a magnetic field model of the daily variations due to the ionospheric current systems. 
Core +Magnetosphere +Ionosphere +Crust  
DIFI7

The Dedicated Ionospheric Field Inversion (DIFI) model is a Swarmbased, global model of the Sq and equatorial electrojet magnetic fields at mid and lowlatitudes. It describes variations with local time, season and solar flux and separates primary and induced magnetic fields.  Ionosphere  
IGRF13

The International Geomagnetic Reference Field (IRGF) is a model describing the core field from 1900 to 2020. The latest version was produced by an international team of scientists, including several from our team, under the auspices of the International Association of Geomagnetism and Aeronomy (IAGA). 
Core  
WMM2020

The current World Magnetic Model (WMM2020) is a degree and order 12 core field model based on satellite observations and forecasting the field until Dec 31, 2024. 
Core  
BOUMME

The Boulder Magnetic Model of the Earth, beta release  Core  
EMM2017

The Enhanced Magnetic Model (EMM) is a degree and order 720 internal field model, resolving magnetic anomalies down to 56 km wavelength. 
Core +Crust  
EMAG2_V3

Earth Magnetic Anomaly Grid: 2 arcminute resolution (EMAG2) is a grid of crustal anomalies reported in two ways, a consistent 4km upward continued grid, and an anomaly altitude at sea level above oceanic regions and 4km above continental regions. 
Crust  
POMME10

The Potsdam Magnetic Model of the Earth (POMME) is a research model that describes both the internal and the external (magnetospheric) fields, taking into account the variability of space weather.  Core +External +Crust  
MF7

CHAMP satellite based model of Earth's crustal magnetic anomaly resolved to degree 133, wavelengths of 300km.  Crust  
NGDC720

The NGDC720 model provides a description of the crustal field from ellipsoidal harmonic degree 16 to 719, corresponding to the waveband of 2500 km to 56 km.  Crust  
EEFM1

The Equatorial Electric Field Model (EEFM) is a satellite based EEF model at 108km altitude as a function of longitude, localtime, season, solar flux, and lunar localtime.  Ionosphere  
PPEEFM

The Prompt Penetration Equatorial Electric Field Model (PPEEFM) describes how the electric field in the equatorial ionosphere varies as a response to solar wind fluctuations.  Ionosphere  
EEJM2

The Equatorial Electrojet Model (EEJM) is a satellite derived model of the EEJ magnetic signature as a function of longitude, localtime, season, solar flux, and lunar localtime.  Ionosphere  
JVDM1

The JULIA (Jicamarca Unattended Longterm Investigations of the Ionosphere and Atmosphere) Vertical Drift Model (JVDM) models vertical plasma drifts at analtitude of 150km, 20 degrees above and below the magnetic equator.  Ionosphere  
gufm1

The gufm1 model describes the magnetic field at the core–mantle boundary for the interval 1590–1990.  Core 
Previous Models
Model  Description  Source  Date 

HDGM2022

Core + Magnetosphere + Ionosphere +Crust  
DIFI6

At mid and lowlatitudes and during quiet geomagnetic times, electrical currents flowing in the ionosphere generate magnetic variations of a few tens of nT on the ground and at lowEarth orbit altitudes. The Sq ("solar quiet") current system takes the form of two largescale vortices on the dayside of the Earth, one in each hemisphere. Due to a local enhancement of conductivity, a stronger current, the equatorial electrojet (EEJ), flows along the dip equator and generates magnetic signatures that can reach up to 150 nT at some locations. 
Ionosphere  
HDGM2021

Core + Magnetosphere + Ionosphere +Crust  
Difi 5

At mid and lowlatitudes and during quiet geomagnetic times, electrical currents flowing in the ionosphere generate magnetic variations of a few tens of nT on the ground and at lowEarth orbit altitudes. The Sq ("solar quiet") current system takes the form of two largescale vortices on the dayside of the Earth, one in each hemisphere. Due to a local enhancement of conductivity, a stronger current, the equatorial electrojet (EEJ), flows along the dip equator and generates magnetic signatures that can reach up to 150 nT at some locations. 
Ionosphere  
HDGM2020

Core + Magnetosphere + Ionosphere +Crust  
WMM2015v2

Core  
HDGM2019

Core + Magnetosphere + Ionosphere +Crust  
Difi 4

At mid and lowlatitudes and during quiet geomagnetic times, electrical currents flowing in the ionosphere generate magnetic variations of a few tens of nT on the ground and at lowEarth orbit altitudes. The Sq ("solar quiet") current system takes the form of two largescale vortices on the dayside of the Earth, one in each hemisphere. Due to a local enhancement of conductivity, a stronger current, the equatorial electrojet (EEJ), flows along the dip equator and generates magnetic signatures that can reach up to 150 nT at some locations. 
Ionosphere  
IGRF12

Core  
WMM2015v1

Core  
HDGM2018

Core + Magnetosphere + Ionosphere +Crust  
DIFI3

At mid and lowlatitudes and during quiet geomagnetic times, electrical currents flowing in the ionosphere generate magnetic variations of a few tens of nT on the ground and at lowEarth orbit altitudes. The Sq ("solar quiet") current system takes the form of two largescale vortices on the dayside of the Earth, one in each hemisphere. Due to a local enhancement of conductivity, a stronger current, the equatorial electrojet (EEJ), flows along the dip equator and generates magnetic signatures that can reach up to 150 nT at some locations. 
Ionosphere  
HDGM2017


Core + Magnetosphere + Ionosphere + Crust  
DIFI2

At mid and lowlatitudes and during quiet geomagnetic times, electrical currents flowing in the ionosphere generate magnetic variations of a few tens of nT on the ground and at lowEarth orbit altitudes. The Sq ("solar quiet") current system takes the form of two largescale vortices on the dayside of the Earth, one in each hemisphere. Due to a local enhancement of conductivity, a stronger current, the equatorial electrojet (EEJ), flows along the dip equator and generates magnetic signatures that can reach up to 150 nT at some locations. 
Ionosphere  
POMME9

POMME is a scientific main field model representing the geomagnetic field in the region from the Earth's surface to an altitude of a couple of thousand kilometers. The time variations of the internal field are given by a piecewise linear representation of the spherical harmonic (Gauss) coefficients of the magnetic potential.  Core + Crust + Magnetosphere  
POMME8

POMME is a scientific main field model representing the geomagnetic field in the region from the Earth's surface to an altitude of a couple of thousand kilometers. The time variations of the internal field are given by a piecewise linear representation of the spherical harmonic (Gauss) coefficients of the magnetic potential. 
Core + Crust + Magnetosphere  
Pomme 7

POMME is a scientific main field model representing the geomagnetic field in the region from the Earth's surface to an altitude of a couple of thousand kilometers. The time variations of the internal field are given by a piecewise linear representation of the spherical harmonic (Gauss) coefficients of the magnetic potential. 
Core + Crust + Magnetosphere  
POMME6

POMME is a main field model providing the geomagnetic field in the region from the Earth's surface to an altitude of a couple of thousand kilometers. The time variations of the field are represented by a Taylor series of the spherical harmonic (Gauss) coefficients of the magnetic potential. We provide the static coefficients for 2005.0 and the first and second time derivatives (secular variation and secular acceleration). 
Core + Crust + Magnetosphere  
POMME5

POMME is a main field model providing the geomagnetic field in the region from the Earth's surface to an altitude of a couple of thousand kilometers. The time variations of the field are represented by a Taylor series of the spherical harmonic (Gauss) coefficients of the magnetic potential. We provide the static coefficients for 2005.0 and the first and second time derivatives (secular variation and secular acceleration). The corresponding geomagnetic power spectrum is shown in Figure 1. 
Core + Crust + Magnetosphere  
EMAG2

rint map (paper and digital download) of EMAG2 available at BGR Geoshop GIS GeoTIFF versions of EMAG2 included in the product table at the bottom of this page 
Crust  
MF6

Satellites in lowEarth orbit (LEO) provide the most effective means of mapping the long wavelengths of the magnetic field caused by the magnetization of the Earth's crust. The first global magnetic anomaly maps were produced from POGO (1960s) and Magsat (1979) satellite measurements. A breakthrough in resolution and accuracy was achieved with the CHAMP satellite, launched in July 2000. Apart from an order of magnitude improvement in magnetometer accuracy, CHAMP was designed to remain in LEO for many years, leading to excellent spatial coverage. 
Crust  
POMME4

POMME is a main field model providing the geomagnetic field in the region from the Earth's surface to an altitude of a couple of thousand kilometers. Seven years of highly accurate CHAMP satellite magnetic measurements offer an unprecedented opportunity to track the time variations of the field originating in the Earth's core. An interesting question is whether we can start to see changes in the secualar acceleration (2nd time derivative) of the geomagnetic field. 
Core + Crust + Magnetosphere  
EEJM1

External  
EMAG3

Marine and airborne magnetic anomaly data have been collected for more than half a century, providing global coverage of the Earth. Due to the changing main field from the Earth's core, and due to differences in quality and coverage, combining these data to a consistent global magnetic grid is challenging. The World Digital Magnetic Anomaly Map (WDMAM) project is an international effort to integrate all available nearsurface and satellite magnetic anomaly data. 
Crust  
MF5

Six years of loworbit CHAMP satellite magnetic measurements have provided an exceptionally highquality data resource for lithospheric magnetic field modeling. Our fifth generation satelliteonly magnetic field model MF5 extends to spherical harmonic degree 100. As a result of careful data selection, extensive corrections, filtering and lineleveling, the model has low noise levels and can be safely evaluated at the Earth’s surface. The model is particularly suited for inferring largescale structure and composition of the lithosphere. 
Crust  
POMME3

POMME is a main field model providing the geomagnetic field in the region from the Earth's surface to an altitude of a couple of thousand kilometers. POMME3.1 includes the time varying core field, crustal field, the ring current field modulated by the Dst/Est/Ist Indices, a time averaged magnetospheric field, the penetration of the horizontal part of the Interplanetary magnetic field (IMF), and the fields induced by Earth rotation in the external fields. 
Core + Crust + Magnetosphere  
POMME2

POMME is a main field model providing the geomagnetic field in the region from the Earth's surface to an altitude of a couple of thousand kilometers. POMME2.5 includes the time varying core field, crustal field, the ring current field modulated by the Dst/Est/Ist Indices, a time averaged magnetospheric field, the penetration of the horizontal part of the Interplanetary magnetic field (IMF), and the fields induced by Earth rotation in the external fields. 
Core + Crust + Magnetosphere  
MF4X

MF4x is a lithospheric field model from CHAMP satellite data, estimated by a new algorithm from the same cleaned data set which was used for MF4. By using linear combinations of spherical harmonics (SH), we defined localized functions which are bandlimited to a given maximum degree. Using these localized basis functions, a model's SH resolution can be varied over the globe. 
Crust 