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Qué (quién) es GEOMAGNETIC - definición
Geomagnetic pole
ONE OF TWO ANTIPODAL POINTS IN THE ARCTIC AND IN THE ANTARCTIC WHERE THE AXIS OF A BEST-FITTING DIPOLE INTERSECTS THE SURFACE OF EARTH
Geomagnetic North Pole; Geomagnetic north pole; North geomagnetic pole; Geomagnetic Pole; Geomagnetic poles; South geomagnetic pole
The geomagnetic poles are antipodal points where the axis of a best-fitting dipole intersects the surface of Earth. This theoretical dipole is equivalent to a powerful bar magnet at the center of Earth, and comes closer than any other point dipole model to describing the magnetic field observed at Earth's surface.
Geomagnetic excursion
A geomagnetic excursion, like a geomagnetic reversal, is a significant change in the Earth's magnetic field. Unlike reversals, an excursion is not a "permanent" re-orientation of the large-scale field, but rather represents a dramatic, typically a (geologically) short-lived change in field intensity, with a variation in pole orientation of up to 45° from the previous position.
Geomagnetic reversal
![Geomagnetic polarity since the middle [[Jurassic]]. Dark areas denote periods where the polarity matches today's polarity, while light areas denote periods where that polarity is reversed. The ''Cretaceous Normal'' superchron is visible as the broad, uninterrupted black band near the middle of the image.](https://commons.wikimedia.org/wiki/Special:FilePath/Geomagnetic polarity 0-169 Ma.svg?width=200 "Geomagnetic polarity since the middle [[Jurassic]]. Dark areas denote periods where the polarity matches today's polarity, while light areas denote periods where that polarity is reversed. The ''Cretaceous Normal'' superchron is visible as the broad, uninterrupted black band near the middle of the image.")
![Geomagnetic polarity during the last 5 million years ([[Pliocene]] and [[Quaternary]], late [[Cenozoic Era]]). Dark areas denote periods where the polarity matches today's normal polarity; light areas denote periods where that polarity is reversed.](https://commons.wikimedia.org/wiki/Special:FilePath/Geomagnetic polarity late Cenozoic.svg?width=200 "Geomagnetic polarity during the last 5 million years ([[Pliocene]] and [[Quaternary]], late [[Cenozoic Era]]). Dark areas denote periods where the polarity matches today's normal polarity; light areas denote periods where that polarity is reversed.")
![magnetic field lines]], blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and vertical. The dense clusters of lines are within the Earth's core.<ref name=Glatzmaier/>](https://commons.wikimedia.org/wiki/Special:FilePath/NASA 54559main comparison1 strip.gif?width=200 "magnetic field lines]], blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and vertical. The dense clusters of lines are within the Earth's core.<ref name=Glatzmaier/>")
CHANGE OF DIRECTION OF EARTH MAGNETIC FIELD
Cretaceous Long Normal; Magnetic reversal; Magnetic polarity reversal; Polar reversal; Flipping of planetary magnetic poles; Geomagnetic Reversal; Cretaceous long normal; Earth's magnetic reversal; Pole reversal; Magnetic pole reversal; Magnetic Pole Flip; Geomagnetic reversals; Geomagnetic flip; Geomagnetic polarity time scale; Earth's polarity; Geomagnetic field reversal; Normal polarity; Polar Reverse; Superchron; Jurassic Quiet Zone; Cretaceous superchron; Cretaceous normal superchron; Magnetic reversals; Polarity reversal; Polar flip; Polarity transition; Cretaceous Quiet Zone; Reversal of magnetic fields; Geomagnetic polarity
A geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged (not to be confused with geographic north and geographic south). The Earth's field has alternated between periods of normal polarity, in which the predominant direction of the field was the same as the present direction, and reverse polarity, in which it was the opposite.
Ejemplos de uso de GEOMAGNETIC
1. What they are looking for is geomagnetic storms, or magnitniye buri.
2. The solar wind is crucial because it protects Earth from deadly cosmic radiation, causes geomagnetic storms on Earth, and is responsible for the aurora borealis.
3. Imagery from STEREO will be valuable for geomagnetic storm warnings and vital for the stability of electric power grids.'4; Challenges facing space exploration will also be discussed.
4. Previous geomagnetic storms have proved more serious, such as the one triggered by the largest flare on record, in November 2003.
5. Until then and probably beyond, Russians will keep on tuning into the space forecast... which, according to Gismeteo.ru, is all clear for the next two days except for a "slight geomagnetic disturbance" between 3 a.m. and ' a.m. on Friday.