Share on Facebook Share on Twitter Email
Answers.com

geomagnetic field

 
Britannica Concise Encyclopedia: geomagnetic field
Home > Library > Miscellaneous > Britannica Concise Encyclopedia

Magnetic field associated with the Earth. It is essentially dipolar (i.e., it has two poles, the northern and southern magnetic poles) on the Earth's surface. Away from the surface, the field becomes distorted. Most geomagnetists explain the field by means of dynamo theories, whereby a source of energy in the Earth's core causes a self-sustaining magnetic field. In the dynamo theories, fluid motion in the Earth's core involves the movement of conducting material within an existing magnetic field, thus creating a current and a self-enforcing field.

For more information on geomagnetic field, visit Britannica.com.

Search unanswered questions...

Enter a question here...
Search: All sources Community Q&A Reference topics

 
 

 

Copyrights:

Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved.  Read more