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magnetic storm |
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magnetic storm a sudden severe disturbance of the earth's magnetic field, caused by emission of charged particles from the sun magnetic storm [mag′ned·ik ′stȯrm] (geophysics) A worldwide disturbance of the earth's magnetic field; frequently characterized by a sudden onset, in which the magnetic field undergoes marked changes in the course of an hour or less, followed by a very gradual return to normalcy, which may take several days. Also known as geomagnetic storm. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Catastrophic threats include earthquakes, tsunamis, landslides, floods, volcanoes, windstorms, extreme precipitation, magnetic storms, avalanches, and impacts, while chronic hazards include shoreline erosion, wind erosion, and permafrost degradation. Magnetic storms on sun-like stars such as HD 179949 are known to generate hot spots, which stand out in the ultraviolet light. Since Gauss laid the basis for the knowledge of the magnetism of the earth, the globe has been covered with stations where one follows the surprising correspondence in the capricious movements of the magnetic needle, and where, in connection with the international North-pole expedition, an important step is now taken toward explanation of magnetic storms by simultaneous observations. |
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