Products & Services

IAGA provides several tools and standards, which are obtained within its Divisions and Working Groups.

1. Tools

International Geomagnetic Reference Field IGRF

This global main field model provides magnetic field values for any location on Earth, e.g. for  navigational purposes (declination) or as a standard for core field subtraction for aeromagnetic surveys. An updated version is adopted by IAGA every 5 years. The model, software and an online-calculator are provided by working group V-MOD.

IAGA endorsed indices of magnetic activity

Magnetic indices describe the activity level of external magnetic fields. IAGA endorsed indices follow strict quality standards defined by working group V-DAT. They are disseminated by the International Service of Geomagnetic Indices, ISGI, and derived by the ISGI Collaborating Institutes. More information on currently endorsed IAGA indices, like e.g. Kp and Dst, can also be found at the working group V-DAT website. Adoption of new indices endorsed by IAGA is done according to the Index Criteria for endorsement of indices by IAGA.

World Digital Magnetic Anomaly Map WDMAM

The first digital and global map of lithospheric magnetic anomalies was obtained through the efforts of an IAGA task group and released in 2007. Information about the map and ongoing efforts on updates can be found on the website of working group V-MOD.

2. Standards

Geomagnetic observatories

IAGA coordinates the global network of geomagnetic observatories by providing unique three-letter codes and maintaining an overview over past and present geomagnetic observatories. The list can be found at the website of working group V-OBS.

Observatory data

IAGA recommends formats for observatory data exchange and provides information about observatory data availability. The information can be found on the website of working group V-DAT.

Advice on gyromagnetic constant

Proton precession and Overhauser magnetometers are common instruments for measuring the geomagnetic field. To ensure a common standard, IAGA recommends the use of the most recent value of the gyromagnetic constant for geomagnetic observations.