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Paleo magnetism 30,000 years ago to today

  1. Jan 10, 2015 #1
    how can i find data for earth magnetism for the period 30,000 years to today, is it possible to control magnetism forces
    thanks
     
  2. jcsd
  3. Jan 10, 2015 #2

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  4. Jan 12, 2015 #3
    While the magnetic field is relatively weak - you can override it with a small magnet, for example - it is global in extent and that represents the expenditure of a large amount of energy. No plausible means of controlling magnetic forces on other than a very small, local level exist, nor could be envisaged in a foreseeable future.
     
  5. Jan 12, 2015 #4
  6. Jan 12, 2015 #5

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    What sort of data are you seeking? Polar wandering? Variations in field strength? Orientation in recent sediments?
     
  7. Jan 12, 2015 #6
    mostly variation of earth magnetic field during that period
     
  8. Jan 12, 2015 #7

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    Local strength (specific geographic locations), or "overall."
     
  9. Jan 13, 2015 #8
    south America
     
  10. Jan 15, 2015 #9
    The IAGA database available through NOAA is out-dated, so don't use it.
    The most up-to-date version of the database for your time of interest can be found here http://geomagia.gfz-potsdam.de/
    There are two databases, one based on sedimentary analyses, which yields only inclination and relative intensity variations, but of high resolution.
    The other, is the archeomagnetic and volcanic database, which has absolute measures of field intensity, but these are only spot readings and often no directional data are available.

    There are also global models, which combine the two databases to estimate global variations. These are limited to the last 10,000 years (due to data availability) and inevitably involve smoothing.

    On a practical note. South America is a relatively poorly sampled region for paleomagnetism, for a number of reasons. So the data from this region is sparse and often of low quality. I think the S. America data only go back a few thousand years.

    Hope this helps.
     
  11. Jan 15, 2015 #10

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    Thank you for confirming my suspicions.
     
  12. Jan 16, 2015 #11
    many thanks ,it look better now but after a very fast reading period from 15,000 to 10,000 seem the poor child
     
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