Access to ground-based observations

• Geomagnetic 1-minute through annual mean values from magnetic observatories world-wide on-line via SPIDR (Space Physics Interactive Data Resource)

• other on-line access
  • Observatory Contact Information
  • Magnetic Repeat Station Data

Magnetic field models and software

• Download the NGDC-720 crustal magnetic field model.
• IGRF magnetic field maps 1900-Present
• Download latest IGRF and WMM
• Magnetic field values online calculator
• Software and coefficients for transforming a spherical harmonic expansion from GSM or SM to GEO
• NGDC hosts some computer programs of interest to students, as mentioned in Introduction to Geomagnetic Fields by W. Campbell (Cambridge University Press, 2nd Ed. 2003).

Data available via FTP

• Magnetic Model maps and grids
• Main Magnetic Field Models
• DoD WMM Maps and Shape files
• Paleomagnetic Data

Access to Marine Data

• Marine Trackline Database

Access to Paleomagnetic Data

• IAGA Paleomagnetic Databases

Access to Magnetic Indices

There are numerous indices of magnetic activity. The International Association of Geomagnetism and Aeronomy (IAGA) offically recognizes magnetic indices aa, Am, Kp, Dst, and AE. More information about the IAGA indices is available from ISGI - International Services for Geomagnetic Indices (off-site).

• AA* Index (Major magnetic storms list)
• Auroral Electrojet Index (AE) (High resolution and hourly data)
• Ap* Index (Major magnetic storms list)
• Disturbance Storm-Time (Dst) Index
• Proposed Est and Ist Indices
• Kp and Ap indices
• Geomagnetic Indices Bulletin

More information about magnetic indices is available from:

• GFZ Potsdam (off-site)
• WDC Geomagnetism, Kyoto
• WDC Geomagnetism, Copenhagen (off-site)
• Observatory de l'Ebro (off-site)

Access to airborne data

• Inventory of airborne data

Imagery

• Images on our FTP Server
• Maps from our FTP Server
• For additional maps - visit the WMM or IGRF web sites