Earth's Inconstant Magnetic Field


	Earth's Inconstant Magnetic Field

amgumen

9-5-2007 11:40 PM

555 views

tags:

science, geology, interesting, environment

8 Comments |

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9-6-2007 12:14 AM

The REAL Napster

a sudden magnetic core shift could be the end of modern technology very quickly. And people for that matter too.

9-6-2007 9:25 AM

ericskiff

From the article, it sounds as if it will take a while to happen, shifting each year. If we maintain a protective magnetic field throughout the switch, how will it affect tech?

9-6-2007 9:26 AM

ericskiff

I should mention that that's a geniuine (not snarky) question

9-6-2007 9:35 AM

The REAL Napster

a sudden magnetic core shift

keyword = sudden

9-10-2007 4:48 PM

cptenaud

So by quoting what you say, that makes you right?

9-10-2007 6:20 PM

skwirlinator

http://www.pbs.org/wgbh/nova/magnetic/

9-10-2007 7:42 PM

The REAL Napster

So by quoting what you say, that makes you right?

No, it is used for clarification, so stupid people don't get confused.

9-10-2007 8:39 PM

skwirlinator

so stupid people don't get confused.

If it were only that simple...

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/44826ede-3608-4047-a1bd-974c64e06e88/A58A62FC-DD43-459F-A9CF-2C89514F153D/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm" href="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm" style="font-size: 11px;">science.nasa.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/science.nasa.gov/img/4A6473CD-97F5-48E3-929E-191BA5B967B4" alt="see caption" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm">The movement of Earth's north magnetic pole across the Canadian arctic, 
          1831--2001.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm">
        The pole kept going during the 20th century, north at an average speed 
          of 10 km per year, lately accelerating "to 40 km per year,</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm">At this rate it will exit North America and reach Siberia 
          in a few decades.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm">globally the magnetic 
          field has weakened 10% since the 19th century.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/science.nasa.gov/img/DCB53252-362B-4EBD-B81D-E0775BB55E5B" alt="see caption" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm">Magnetic stripes around mid-ocean ridges reveal the history of Earth's 
          magnetic field for millions of years.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm">Sometimes 
          the field completely flips. The north and the south poles swap places. 
          Such reversals, recorded in the magnetism of ancient rocks, are unpredictable. 
          They come at irregular intervals averaging about 300,000 years; the 
          last one was 780,000 years ago</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/science.nasa.gov/img/F85B6A31-DCBB-445E-8E00-D93782AB060F" alt="see caption" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm">The outer core is the source 
          of the geomagnetic field.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm">Reversals 
          take a few thousand years to complete, and during that time--contrary 
          to popular belief--the magnetic field does not vanish. "It just 
          gets more complicated,</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://science.nasa.gov/headlines/y2003/29dec_magneticfield.htm"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/science.nasa.gov/img/73F510A5-CAAE-4237-BAEE-08C8668333A4" alt="see caption" /></div></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/A58A62FC-DD43-459F-A9CF-2C89514F153D/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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