geomagnetic reversal

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• Geomagnetic reversal — Magnetic reversal redirects here. For switching of a magnet, see Magnetization reversal. Geomagnetic polarity during the late Cenozoic Era. Dark areas denote periods where the polarity matches today s polarity, light areas denote periods where… …   Wikipedia

• geomagnetic reversal — Alternation of the Earth s magnetic polarity. The Earth s internal magnetic field reverses, on average, about every 300,000 to 1 million years. This reversal is very sudden on a geologic time scale, apparently taking about 5,000 years. The time… …   Universalium

• Geomagnetic pole — Illustration of the difference between geomagnetic poles (Nm and Sm) and geographical poles (Ng and Sg). The geomagnetic poles are antipodal points where the axis of a theoretical dipole intersects the Earth s surface. This dipole is equivalent… …   Wikipedia

• geomagnetic field — Magnetic field associated with the Earth. It is essentially dipolar (i.e., it has two poles, the northern and southern magnetic poles) on the Earth s surface. Away from the surface, the field becomes distorted. Most geomagnetists explain the… …   Universalium

• Geomagnetic excursion — A geomagnetic excursion, like a geomagnetic reversal, is a significant change in the Earth s magnetic field. Unlike reversals however, an excursion does not change the large scale orientation of the field, but rather represents a dramatic,… …   Wikipedia

• Geomagnetic storm — This article is about disturbances within Earth s magnetosphere. For other uses of magnetic storm , see Magnetic storm (disambiguation). Solar particles interact with Earth s magnetosphere. A geomagnetic storm is a temporary disturbance of the… …   Wikipedia

• Brunhes-Matuyama reversal — The Brunhes Matuyama Reversal was a geologic event, approximately 780,000 years ago, when the Earth s magnetic field last underwent reversal. The reversal occurred over several thousand years. The apparent duration at any particular location… …   Wikipedia

• Gauss-Matuyama reversal — The Gauss Matuyama Reversal was a geologic event approximately 2.588 million years ago when the Earth s magnetic field underwent reversal.This event, which separates the Piacenzian from the Gelasian and marks the start of the Quaternary… …   Wikipedia

• Jaramillo reversal — The Jaramillo reversal was a reversal of the Earth s magnetic field that occurred approximately one million years ago. In the geological time scale it was a short term positive reversal in the then dominant Matuyama reversed magnetic chronozone;… …   Wikipedia

• 2012 phenomenon — Part of a series on …   Wikipedia

• Earth's magnetic field — Computer simulation of the Earth s field in a normal period between reversals.[1] The tubes represent magnetic field lines, blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and… …   Wikipedia