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Is the earth's magnetism decreasing?

  1. Nov 19, 2003 #1
    i saw an article the other night on public television of the earth's decreasing magnetism. does anyone have an idea what is going to happen in the next thousand years to the earth's "blanket"? i understand it will renew back, as it has many times in the past, although the poles will shift, but what will that mean to humanity?
    of course no one is at threat born today even in a worst case senario, or are they? who knows? who has an idea? given evidence of the past, no major event on earth has left life on earth unaffected in some way.
  2. jcsd
  3. Nov 19, 2003 #2
    I heard that if it continues the way it has (but we don't know that it will), the field will be gone in 200 years. That is unlikely though, it will probably do all sorts of weird stuff. I have also heard from a psychic that it will collapse or move a lot or flip or something within a decade or so. So who knows.
  4. Nov 19, 2003 #3


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    Staff: Mentor

    You pretty much have it right, bblly. It'll decrease, flip, and increase again. It does that every now and then. And it won't do much to harm us.
  5. Nov 19, 2003 #4


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    Science Advisor

    There's a thread about it in Earth Sciences, and a link to a website by a guy who's trying to build a model; http://complex.umd.edu/dynamo/index.html [Broken], if you want to read more about it.
    Last edited by a moderator: May 1, 2017
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