These in turn produce the Earth's magnetic field. The convection movements in the core are chaotic; the magnetic poles drift and periodically change alignment. This results in at irregular intervals averaging a few times every million years. The most recent reversal occurred approximately 700,000 years ago.
The field forms the, which deflects particles in the The sunward edge of the is located at about 13 times the radius of the Earth. The collision between the magnetic field and the solar wind forms the, a pair of conce-shaped regions of energetic. When the enters the Earth's atmosphere at the magnetic poles, it forms the
The earth is shaped roughly as a with the poles currently located proximate to the planet's geographic poles. According to the field is generated within the molten outer core region where heat creates convection motions of conducting materials, generating electric currents.
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