File:South Magnetic Pole 1945 2000.jpg
South_Magnetic_Pole_1945_2000.jpg (385 × 485 pixels, file size: 35 KB, MIME type: image/jpeg)
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Summary
[edit]DescriptionSouth Magnetic Pole 1945 2000.jpg |
English: Variations in the Earth's Magnetic Field - South magnetic pole 1945-2000. |
Date |
circa 2000 date QS:P,+2000-00-00T00:00:00Z/9,P1480,Q5727902 |
Source | http://nationalatlas.gov/articles/geology/a_geomag.html#four |
Author | John Hillhouse, USGS |
Courtesy of John Hillhouse, USGS The intensity and structure of the Earth's magnetic field are always changing, slowly but erratically, reflecting the influence of the flow of thermal currents within the iron core. This variation is reflected in part by the wandering of the North and South Geomagnetic Poles. Because a wide range of commercial and military navigation and attitude/heading systems are dependent on models of the magnetic field, these models need to be updated periodically. The magnetic field's strength and direction and their rates of change are predicted every 5 years for a 5-year period.
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Licensing
[edit]Public domainPublic domainfalsefalse |
This map was obtained from an edition of the National Atlas of the United States. Like almost all works of the U.S. federal government, works from the National Atlas are in the public domain in the United States.
Online access: NationalAtlas.gov | 1970 print edition: Library of Congress, Perry-Castañeda Library čeština | Deutsch | English | français | Bahasa Indonesia | italiano | македонски | മലയാളം | sicilianu | 中文 | 中文(简体) | 中文(繁體) | +/− |
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current | 09:57, 13 August 2007 | 385 × 485 (35 KB) | DMY (talk | contribs) | ||
09:46, 13 August 2007 | 385 × 485 (25 KB) | DMY (talk | contribs) | |||
09:42, 13 August 2007 | 355 × 454 (25 KB) | DMY (talk | contribs) | |||
09:39, 13 August 2007 | 401 × 490 (25 KB) | DMY (talk | contribs) | |||
08:58, 13 August 2007 | 401 × 490 (25 KB) | DMY (talk | contribs) | == Summary == Variations in the Earth's Magnetic Field - South magnetic pole 1945-2000 [http://nationalatlas.gov/articles/geology/a_geomag.html#four] Courtesy of John Hillhouse, USGS The intensity and structure of the Earth's magnetic field are always |
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