what is Geomagnetism ?? || magnetic,earth,space, geography, Geomagnetism.|| Chiseled info

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WHAT IS GEOMAGNETISM ?
Scientists believe that Earth's magnetism aries from electric currents generated by the movement of hot liquid iron in it's core .The currents create a magnetic field with invisible lines of force flowing between Earth Geomagnetic poles . These are not the same as the North and South Poles and , more significant , they are not stationary . The Geomagnetic poles mark the ends of the axis of Earth's magnetic field. 

In 1971 a group of scientists investigating a 30,000 year old aboriginal campsite in Australia discovered that the fire's heat had allowed iron particles in the stone to realign with Earth's magnetic field at the time . What's more , the iron particles pointed south, indicating that magnetic north at that time must have been somewhere in the Antractic . The discovery confirmed other recent reversal of the Earth's magnetic field.
It is now understood that major reverals in Earth's magnetic field occur about every half million years . Shorter flips , lasting a few thousand to 200,000 years , occur at other times . These reversals are clearly recorded in the rocks created in the seafloors mid-atlantic Ridge , which are carried away from the ridge by shifting ocean-floor plates

Earth's magnetic field dominantes a region called the magnetosphere , which wraps around the planet and the atmosphere .
                    Solar wind ---charged particles flowing from the sun-presses the magnetosphere against Earth on the side facing the sun and stretches it on the shadow side .

Nevertheless , some particles of solar wind do leak through and are trap in the Van Allen belts . When they hit atoms of gas in the upper atmosphere near the Geomagnetic poles , they produce the eerie light displays that are called aurora's.


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