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Old March 9th 10, 02:43 AM posted to sci.astro
dlzc
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Default Earth's magnetic field may have been weaker billions of years ago

Dear Yousuf Kahn:

On Mar 8, 6:09*am, Yousuf Khan wrote:
dlzc wrote:
Then why are we still in the cycle of losing our
protective geomagnetic force and its
magnetosphere at roughly 0.1%/year?


What is increased, can decrease again.


Although that's possibly true, but the only person
who believes that the magnetic field is decreasing
right now is Brad.


So does most of the scientific community.
http://en.wikipedia.org/wiki/Earth%2...ield_detection
http://www.windows.ucar.edu/tour/lin...h_brunhes.html
http://image.gsfc.nasa.gov/poetry/ma...magnetism.html
.... about 5% every 100 years.

But nothing monotonic about the field strength...

David A. Smith