Geomagnetic Data Service

Data Usage Rules

The rules for the data use and exchange are defined by the International Council for Science - World Data System (ICSU-WDS) Data Sharing Principles. The data and services at the WDC Kyoto are available for scientific use without restrictions, but for the real-time (quicklook) data, please contact our staff (wdc-service@kugi.kyoto-u.ac.jp) before using those in publications and presentations. The WDC Kyoto does not allow commercial applications of the geomagnetic indices.

For commercial applications of the geomagnetic data provided by each observatory, please contact the relevant institute. Information on the institution is supplied within the data sets. When the data are used in publications and presentations, the data suppliers and the WDC for Geomagnetism, Kyoto should be acknowledged. Furthermore, when using the AE index, Dst index, and ASY/SYM indices, please include data DOIs in the Reference section. Rules of the road.

NewEvery dataset, one gateway — the WDC Kyoto HAPI server

All of our indices and observatory data — Dst, AE, ASY/SYM, Kp/ap, Q- and D-days and 1-second to 1-hour observatory values — now come through one HAPI API, as CSV, JSON, IAGA-2002 or WDC. The Geomagnetic Data Explorer plots them together in your browser and downloads exactly the interval you are looking at.

  • 1,000+ datasets
  • 325 observatories
  • 1932–present
Open the Geomagnetic Data Explorer → HAPI API documentation
Screenshot of the plot page: a panel-settings sidebar on the left and stacked panels of SYM-H, AE/AL/AU and the Kakioka X component for the storm of 17 March 2015 on the right, with the Kp scale along the top.
Example: the storm of 17 March 2015 — click to open it.

Geomagnetic Indices Derived by WDC Kyoto

Auroral Electrojet (AE) Index

Version definition (PDF)

Real-time AE Index Today

Dst Index

Version definition (PDF)

Dst Index Last Month
Dst Index Present Month

ASY/SYM Index

SYM Index

Geomagnetic Data

Observatory Metadata Database

Digital Geomagnetic Data

Real-time Kakioka Observatory Plot

For more details: Data Catalogue (PDF)

Analog Magnetogram Images

COMPASS Magnetogram

External Geomagnetic Indices

Kp and ap/Ap Indices

Provided from GFZ Helmholtz Centre Potsdam

International Q- and D-days

Provided from GFZ Helmholtz Centre Potsdam

Models and Tools

IGRF-14

IGRF Model

Ionospheric Conductivity

Ionospheric Conductivity Model

Additional Resources

Databooks

Research Papers

Opening the Geomagnetic Data Explorer (HAPI)

Every dataset is plotted and downloaded here, from our HAPI server (about the API). Download as CSV, JSON, IAGA-2002 or WDC, for exactly the interval you are looking at.

Rules of the road

The data are available for scientific use without restriction, but the data suppliers and the WDC for Geomagnetism, Kyoto, must be acknowledged in publications and presentations. Commercial application of the geomagnetic indices is not permitted (full Rules of the road).

Open Explorer →