Paleo magnetism 30,000 years ago to today

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  • #1
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how can i find data for earth magnetism for the period 30,000 years to today, is it possible to control magnetism forces
thanks
 

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  • #3
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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
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What sort of data are you seeking? Polar wandering? Variations in field strength? Orientation in recent sediments?
 
  • #6
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What sort of data are you seeking? Polar wandering? Variations in field strength? Orientation in recent sediments?
mostly variation of earth magnetic field during that period
 
  • #7
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Local strength (specific geographic locations), or "overall."
 
  • #8
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south America
 
  • #9
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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.
 
  • #10
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On a practical note. South America is a relatively poorly sampled region for paleomagnetism
Thank you for confirming my suspicions.
 
  • #11
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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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