This webpage provides information about the activities of the Working Group DAT of Division V (WG-V.DAT) of the International Association of Geomagnetism and Aeronomy ( IAGA Div. V ). At the XXIII General Assembly of the International Union of Geodesy and Geophysics ( IUGG ) held at Sapporo, Japan from 30 June to 11 July, 2003, the Division V of IAGA was re-organized and the current WGV.DAT, dealing with Geomagnetic data and indices, represents the former Working Group V-2. This working group defines formats for data exchange and sets quality standards for indices of magnetic activity. WG-V.DAT encourages free exchange of scientific information. Your comments are welcome

The latest format for observatory ASCII data dissemination is the IAGA2002 Exchange format. There are numerous indices of magnetic activity. The International Association of Geomagnetism and Aeronomy ( IAGA ) officially recognizes magnetic indices aa, am, Kp, Dst, and AE. More information about the IAGA indices is available from International Services for Geomagnetic Indices ( ISGI ).

IAGA Exchange Format

Suggested Modifications of IAGA 2002 format

Criteria for IAGA endorsement of indices

Access to Magnetic Indices

• aa Index
• am Index
• Kp Index
• Disturbance Storm-Time Index (Dst)
• Auroral Electrojet Index (AE)

Plot of the stations whose data are used for the calculation of the corresponding indices

Access to data from Geomagnetic observatories

• Kyoto, Japan
• Edinburgh, UK
• Copenhagen, Denmark
• Mumbai, India

The International Real Time Magnetic Observatory Network ( INTERMAGNET ) programme exists to establish a global network of cooperating digital magnetic observatories, adopting modern standard specifications for measuring and recording equipment, in order to facilitate data exchanges and the production of geomagnetic products in near real time.

Information on ground, marine and airborne magnetic data and indices are available from the National Geophysical Data Center, Boulder (NGDC). The Space Physics Interactive Data Resource of NGDC ( SPIDR) offers geomagnetic data and indices.

Geomagnetic data is also available from the World Data Centers for Solar Terrestrial Physics in Russia and China

Old magnetograms that are converted to digital images, as part of ICSU supported project "Rescue of old Analogue Magnetograms by converting to Digital Images", are available for download here.

Indian Institute of Geomagnetism
Kalamboli Highway, New Panvel (W),
Navi Numbai 410218, India
Tel: +91-22-27480760
Fax: +91-22-27480762

Department of Ocean-Atmosphere Interaction,
Arctic and Antarctic Research Institute,
Russian Federal Service for Hydrometeorology and Environmental Monitoring
38 Bering Street,
199397 St.Petersburg, Russia
Tel: (+7) (812) 352 19 11
Fax: (+7) (812) 352 26 88