On Thu, 20 Nov 2003 22:17:21 GMT, "Alan"
wrote:

One interesting point brought up was that Mars doesn't have a magnetic
field. The idea was that its core was too cool. Similarly, as Earth's core
cools, albeit slowly, its magnetic field will become weaker and weaker.

Call back in, say, a billion years or two, and maybe the long term
average will be down 3dB.

73's
Richard Clark, KB7QHC