Open Questions: Earth's Magnetic Field
- Summary of April 2004 article from
"Earth is a laboratory for a vast array of natural phenomena.
One of the most fascinating of these is the way that the planet's
magnetic field changes over time. We know that the Earth last
reversed its north and south magnetic poles about 778 000 years
ago, although analyses of the magnetization of geologic materials
suggest that our planet has tried to reverse its polarity several
times since then. This might seem like a long time but it is really
only moments ago in the three plus billion year history of the
Earth's magnetic field."
Mini Earth created in the lab
- May 2000 news article from
about a laboratory dynamo mechanism that produces the Earth's
Earth's poles may switch
- January 1999 news article from
about a prediction that Earth's magnetic poles may flip in
the next 1000 years.
North by Northwest
Science News, December 22, 2007
- The planet's wandering magnetic poles help reveal
history of Earth and humans.
Copyright © 2002 by Charles Daney, All Rights Reserved