Geomagnetic storm also known as Solar storm (or) simply magnetic storm is nothing but the disturbance in the Earth's upper atmosphere due to large eruptions from the Sun's Corona. These eruptions consists of protons and electrons with few thousands of electron volts known as Plasma.
The speed of the plasma as it moves between the planets would range from 10 to 2000 km/s. This plasma would reach the Earth's surface 21 hours after its eruption. The pressure of the plasma is transmitted to the outer edge of the Earth's magnetosphere, hence it causes a drastic increase in the geomagnetic field over the entire Globe.
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http://www.wonderwhizkids.com/index.php/geomagnetic-storms
The speed of the plasma as it moves between the planets would range from 10 to 2000 km/s. This plasma would reach the Earth's surface 21 hours after its eruption. The pressure of the plasma is transmitted to the outer edge of the Earth's magnetosphere, hence it causes a drastic increase in the geomagnetic field over the entire Globe.
read more.....
http://www.wonderwhizkids.com/index.php/geomagnetic-storms
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