Thursday, January 13, 2005

Earth, The ionospheric dynamo

Above the Earth's surface, the next source of magnetic field is the ionospheric dynamo - an electric current system flowing in the planet's ionosphere. Beginning at about 50 kilometres and extending above 1,000 kilometres with a maximum at 400 kilometres, the ionosphere is formed primarily by the action of sunlight on atmospheric particles. There, sunlight strips electrons

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