The Intensity & Nature of the
Earth's Magnetic Field 
A compass tells you what direction
is 'North', but have you ever wondered how it can do that? The answer has to do
with something called magnetism. Every magnet produces an invisible area of
influence around itself. When things made of metal or other magnets come close
to this region of space, they feel a pull or a push from the magnet. Scientists
call these invisible influences FIELDS.
Using our premise that the Earth
provides us with the perfect parameters for the health of our bodies, we shall
explore the 4 aspects of the earth's magnetic field and naturally occuring PEMF
(pulsed electromagnetic) frequencies. So we will begin by discussing
intensity.
The intensity is the STRENGTH of the earths magnetic
field. Think of a strong electromagnet that can actually lift cars in a
junkyard versus a smaller weak horseshoe magnet that barely picks up iron
nails. Both create a magnetic field, the difference is
intensity.
Currently the earth's intensity is between 30
and 60 microtesta (uT) or .3 - .6 gauss. Its stronger at the poles and weaker
near the equator.
The Earth itself is like a big bar magnet
(approximately a dipole), and the magnetic field looks similar to the
picture above, though that picture is simplified (actually the more
accepted theory is called the dynamo theory which says that the pulsating
magnetic fields in the sun induce a current in the molten outer core of the
earth (which has lots of free electrons) and that current in turn produces a
magnetic field by ampere's law (see below).
The magnetic poles are
inclined about 11.3 degrees from the planet's axis of
rotation.
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The Highly Energetic Nature of the
Earth We Live on... 
The
Solar Wind is a relentless storm of energy emitted from the Sun that races
outwards through space at rapidly and wildly fluctuating speeds of 200 - 700 km
per second. These pulsating flows of energy create enormous pulsing electric and
magnetic fields throughout space.
Additionally, there are approximately
100 lightning strikes every second on the earth which equals a staggering 8.64
million strikes a day!
This is the highly energetic environment within
which we on planet Earth exist...
Magnetic fields extend
indefinitely into space but become weaker as the distance increases from their
source. The earth's magnetic field, which extends thousands of miles into space
is called the magnetosphere.
The strength of the field at the Earth's
surface ranges from less than 30 microteslas (0.3 gauss) in an area including
most of South America and South Africa to over 60 microteslas (0.6 gauss) around
the magnetic poles.
The field is similar to that of a bar magnet but this
similarity is not really correct. The magnetic field of a bar magnet, or any
other type of permanent magnet, is created by the synchronized spins of
electrons and nuclei within the atoms. The Earth's core, however, is hotter than
1000 K, at which the orientations of spins within iron become chaotic. This
causes the iron deposits to lose their magnetic field. Therefore
the Earth's magnetic field is caused not by magnetized iron deposits, but mostly
by electric currents in the liquid outer core. This happens because the liquid
outer core has a plethora of free electrons that form a current due to the
pulsating magnetic fields of the sun (via Faradays Law). This is how power is
created at the powerplant. A changing magnetic field (generator) produces a
electric current.
This electric current produced in the outer core than
in turn creates a magnetic field by ampere's law (see below).
This is the
Dynamo Theory and it
explains how the earth's magnetic field is sustained.
Another feature
that distinguishes the Earth magnetically from a bar magnet is its
magnetosphere. At large distances from the planet, this dominates the surface
magnetic field. Electric currents induced in the ionosphere also generate
magnetic fields.
Ampere's Law 
The IMPORTANT point of explaining
this is that the earths magnetic field is produced by electrical currents which
by Ampere's law produces a magnetic field.
This is a very important
reason why pulsed magnetic therapy mats are more effective than static magnetic
mattress pads. All the pulsed magnetic therapy mats on the market use electrical
currents NOT static magnetics, just like the earth.
To better understand
how currents create magnetic fields check out the link below. Don't worry about
all the equations, just notice the pictures. See how a current produces a
magnetic field using the right hand rule and how magnetic iron filings align
around the field. Also notice how a current loop produces a north-south dipole
similar to a bar magnetic. This is how the pulsed magnetic therapy devices on
the market work. The use one or several bundles of conducting loops that create
a north-south dipole.
http://electron9.phys.utk.edu/phys136d/modules/m7/Ampere.htm
So What Magnetic Intensity is Best for
Us? 
If you have been following my line
of reasoning so far, it is clear, use intensities within nature's limits (30-60
uT). In fact, all the top and best researched companies making pulsed magnetic
therapy mats independently discovered that weak magnetic fields on the same
order of the earth's intensities, work better than stronger fields.
So
more is not better, in fact, less is more.
And to properly duplicate
nature, static magnetics are not the choice because as we just explained the
earth's magnetic field is produced by moving electric currents in the outer
liquid core. The magnetic field of the Earth is DYNAMIC, not static as many
people mistakingly think.
So if we seek to duplicate Nature, the
strength of the Magnetic field we should look for would be approximately
0-100 uT (or 0-100 Gauss). AND the magnetic field should be DYNAMIC not static.
This means a pulsating magnetic field (PEMF).
Here's one final point
which hints that high intensities are not desirable and even could be dangerous
(there are some very high powered PEMF devices on the market - this is very
UNNATURAL and potentially dangerous):
The World Health Organization considers a continuous magnetic field of
100 micro-Tesla (1 Gauss) at 50Hz as safe.
Further the limit of strength for induced
electromagnetic fields according to DIN (german industry norm) is 400 uT. There
are no known risks with use of systems of low electromagnetoc fields, but stay
away from units going above 400 uT.
Again, it's best to stick
with Nature and even the government agencies recognize this.
Part 4: Frequency
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