IAGA provides several tools and standards, which are obtained within its
Divisions and Working Groups.
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.
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
IAGA recommends formats for observatory data exchange and provides information
about observatory data availability. The information can be found on the
website of working
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.