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Old 10-19-2006
dongcute
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Solar wind + Weak magnetic field = No water?

Is it possible that one day, the earth magnetic field get so weaken that solar wind could strip off water from earth? I ask this because of this article which leads me to draw the parallel. http://www.geotimes.org/sept04/NN_solarstorms.html
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Old 10-19-2006
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http://en.wikipedia.org/wiki/Earth's_magnetic_field#Magnetic_field_decay

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The earth's magnetic field strength was measured by Carl Friedrich Gauss in 1835 and has been repeatedly measured since then, showing an exponential decay with a half-life of about 1400 years. This could also be stated as a relative decay of about 10% to 15% over the last 150 years.
Earth appears to be heading toward another pole reversal. Once the reversal takes place, to the best of my understanding, the magnetic field's power is replenished from all the excitement of the change.
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Old 10-19-2006
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The problem is a little more complicated. If the field ere permanently lost, yes, the solar wind will strip away the atmosphere faster than it is currently. However, we would only experience a loss if volcanic activity didn't replenish the atmosphere faster than it would be lost.
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Old 10-19-2006
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Hi Guys!
Has anyone figured out from the geological record, how much time it took in the past, for a complete magnetic reversal?
Also is there any way to figure out how much the Solar wind degenerated our atmosphere from studying the gases trapped in the rocks archeologically, when a previous reversal occured?
Dennis
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Old 10-19-2006
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http://en.wikipedia.org/wiki/Earth%2...ield_reversals

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Old 10-19-2006
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Thanks Dragon!
That gives me one answer, but what about Gas content in the geologic record during one of these reversals? or water content?
Dennis
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Old 10-20-2006
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I really don't know, I wasn't able to find anything.

Throw this up at BAUT and you are more likely to find an answer as 50 people doing research gets much more result then one or two.
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Old 10-22-2006
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Thks to all who reply
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Old 10-23-2006
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Dong, FYI the question was answered in a bit more depth here.
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