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Raskal
Navigator

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USA
162 Posts
Initially Posted - 04/07/2004 :  15:48:40  Show Profile
CNN.com has an interesting summary of an article to appear in the April 8 issue of Nature describing how the earth may be partway into the cycle that will flip the magnetic poles (which happens 4 times every million or so years). At the high point of the transition the poles will exert only 10% of their normal attraction. A couple of centuries of that could wipe out the compass as a navigation tool...

http://www.cnn.com/2004/TECH/space/04/07/poles.reverse/index.html

Rich Kokoska
[P.O.] 1984 C25 FK/SR #4603 "Coolatta", Groton, Conn.
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Doug G.
1st Mate

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USA
49 Posts
Response Posted - 04/07/2004 :  18:16:47  Show Profile
There is a great book I just read last weekend . KRAKATOA, by Simon Winchester. In the process of an excellent geologic description of Plate Tectonics, he covers the variations in magnetism over the ocean floor. It seems like a dry subject but I was impressed with the enthusiam that his writing expressed. It fits very well with this topic.
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cshaw
Captain

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USA
460 Posts
Response Posted - 04/07/2004 :  18:46:03  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Raskal</i>
<br />CNN.com has an interesting summary of an article to appear in the April 8 issue of Nature describing how the earth may be partway into the cycle that will flip the magnetic poles (which happens 4 times every million or so years). Rich Kokoska
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Thank goodness! I was about to waste an afternoon swinging ship to get my compass back into the ballpark. No need to do do that for now!!!!! &lt;grin&gt;

Chuck
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Raskal
Navigator

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USA
162 Posts
Response Posted - 04/07/2004 :  18:51:28  Show Profile
<i>Krakatoa : The Day the World Exploded </i> [http://www.amazon.com/exec/obidos/ASIN/0066212855/qid=1081377639/sr=2-1/ref=sr_2_1/103-5015217-0420639] is a fabulous book--Winchester walks the reader through every aspect of the awesome eruption of 1888, including the logs of ships anchored under the rain of ash, the tidal waves, the noise that registered on instruments in all corners of the planet. He gives a treatise on plate tectonics and a critique of the awful 1965 movie "Krakatoa East of Java". You can't pack much more into a book that you can buy at the supermarket...

Rich K.
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oldsalt
Admiral

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USA
578 Posts
Response Posted - 04/07/2004 :  20:49:39  Show Profile
Krakatoa is in fact, West of Java which doesn't speak well for the research done for the movie.
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Douglas
Master Marine Consultant

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1595 Posts
Response Posted - 04/07/2004 :  21:28:20  Show Profile  Visit Douglas's Homepage
If the poles reversed wouldn't it be East ?
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oldsalt
Admiral

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USA
578 Posts
Response Posted - 04/07/2004 :  22:02:45  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Douglas</i>
<br />If the poles reversed wouldn't it be East ?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

That's about what it would take.
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Raskal
Navigator

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USA
162 Posts
Response Posted - 04/08/2004 :  17:57:08  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Krakatoa is in fact, West of Java which doesn't speak well for the research done for the movie.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Douglas has some theories on all that East-West stuff...
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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