Geomagnetic field - Sources, Variation, Steady

geomagnetic field

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Understand Earth's geomagnetic field through the dynamo effect principle

position of Earth's geomagnetic North Pole

Watch the aurora australis, the southern lights, from outer space

particle motion in Earth's magnetic field

northern portion of magnetopause current

For Students

geomagnetic field summary

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In this aerial photo, structures are damaged and destroyed October 15, 2005 in Balakot, Pakistan. It is estimated that 90% of the city of Balakot was leveled by the earthquake. The death toll in the 7.6 magnitude earthquake that struck northern Pakistan on October 8, 2005 is believed to be 38,000 with at least 1,300 more dead in Indian Kashmir. SEE CONTENT NOTES.

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Albert Einstein in Washington, D.C. c. 1921-1923. Physicist

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Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

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After a perfect launch, spectators try to catch a last glimpse of Space Shuttle Columbia, barely visible at the top end of the twisted column of smoke.

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Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

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Julius Caesar in full Gaius Julius Caesar (100? BCE-44 BCE) statue in Rimini, Italy. Roman general and statesman and dictator

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The main magnetic field of Earth, as observed at the surface, changes continuously with time. Changes of very short duration compared with geologic processes are called secular variation. Observations of declination made in London since 1540, for example, show that the direction of the field at that site has nearly completed a full cycle with a peak-to-peak amplitude of 30°. Οther components of the field have been observed for a shorter length of time, but they also are exhibiting similar rapid change. The characteristics of the secular variation are often represented by superimposing maps of the rate of change of ...(100 of 14820 words)

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