What is the Strength of Earth's Magnetic Field and How Can It Be Measured?

AI Thread Summary
The Earth's magnetic field strength varies globally, with recent data indicating a long-term decrease over thousands of years. Satellite measurements over the past decade have been conducted, but specific data on the global magnetic field's changes during this period is lacking. Users are seeking resources that provide detailed, up-to-date information on the magnetic field's strength and its monthly or yearly variations. The National Geophysical Data Center offers some insights, but comprehensive data on recent trends is still needed. Access to such information may be limited or not readily available to the public.
thick0122
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I was wondering what the magnitude is of the Earth's magnetic field? Or perhaps websites that may help to determine this magnitude for specific places on earth. thankyou
 
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A Google search for "earth's magnetic field" gave me this on the first page:

http://www.ngdc.noaa.gov/seg/geomag/magfield.shtml from the National Geophysical Data Center.
 
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The global magnetic strengths of the Earth have been decreasing for several thousands years.
Especially during the last 10 years all kind of measurements have taking place from satellites.
But so fare I haven’t find any available data showing exactly what have happen to the GLOBAL magnetic field the last 10 years. I mean is the global magnetic field still decreasing, - if yes, - how much month by month / year by year .Does someone have tips where such available data can be found? – Or are such data at all available for everyone ? thankyou
 
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Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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It may be shown from the equations of electromagnetism, by James Clerk Maxwell in the 1860’s, that the speed of light in the vacuum of free space is related to electric permittivity (ϵ) and magnetic permeability (μ) by the equation: c=1/√( μ ϵ ) . This value is a constant for the vacuum of free space and is independent of the motion of the observer. It was this fact, in part, that led Albert Einstein to Special Relativity.
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