The Earth's real magnetic field is a sum of several contributions including the
main (core) field, the crustal (anomaly) field, and the external source (magnetospheric)
fields. The core contribution dominates the field from the Earth's surface up to about
four Earth radii.
Beyond four Earth radii, the Earth's magnetic field is increasingly affected by the solar wind interaction with the earth's magnetosphere. The distortions can be described by several external source fields caused by magnetospheric current systems. One can identify three main current systems in the undisturbed outer magnetosphere:
|If you have questions/comments about the various models, contact:Dr. Dieter K. Bilitza. If you have any questions/comments about Web access to run models, contact: Dr. Natalia Papitashvili, Mail Code 612.4, NASA/Goddard Space Flight Center, Greenbelt, MD 20771|
NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility