3.2 Billion-Year-Old Surprise: Earth Had Strong Magnetic Field

Geophysicists at the University of Rochester announce in the 5 April 2007 issue of Nature that the Earth's magnetic field was nearly as strong 3.2 billion years ago as it is today.

5 April 2007 Nature - Geomagnetic field strength 3.2 billion years ago recorded by single silicate crystals - link will require subscription to Nature

News Articles related to the Nature publication:

University of Rochester press release

LiveScience - Earth's Protective Magnetic Field Older Than Thought
New Scientist - Earth's Magnetic Field Grew Strong at Young Age
Malaysia Sun - Earth's Magnetic Field 3.2 bln-years-ago as strong as today
Astrobiology Magazine - Earth's Magnetic Cocoon

NASA's Solar System Exploration News & Events

United Press International - New Earth Magnetic Field Study Completed
Local News: Rochester's Democrat and Chronicle - UR work studies magnetism of Earth
"Unerwartet altes Erdmagnetfeld" - German newspaper article