“Chandler wobble”的概念、定义、翻译、参考文献-科学参考

Chandler wobble

Astronomy

The irregular movement of the Earth’s geographical poles over the surface, anticlockwise for the north pole and clockwise for the south. The effect is very small, the displacement of the pole being less than 10 m, but it produces slight but detectable changes in latitude and longitude of the order of 0″.3. This polar motion is a displacement of the poles with respect to the Earth, not the star background, and hence is quite distinct from precession, which is a variation in the direction of the Earth’s axis in space. It is named after the American astronomer Seth Carlo Chandler (1846–1913).

Geology and Earth Sciences

The free oscillation of the Earth’s pole of rotation, discovered in 1891 by the American astronomer Seth Carlo Chandler (1846–1913). This wobble in the Earth’s rotation has a 435-day periodicity and appears to have a decay time of the order of 40 years. The cause (excitation) is unknown: atmospheric effects appear to be on too short a timescale; earthquake activity has been proposed, but has not been established. The major cause appears to be related to the Earth’s core and its magnetic coupling with the lower mantle. In 2005 the wobble changed phase by 180°.

单词	Chandler wobble
释义	Chandler wobble Astronomy The irregular movement of the Earth’s geographical poles over the surface, anticlockwise for the north pole and clockwise for the south. The effect is very small, the displacement of the pole being less than 10 m, but it produces slight but detectable changes in latitude and longitude of the order of 0″.3. This polar motion is a displacement of the poles with respect to the Earth, not the star background, and hence is quite distinct from precession, which is a variation in the direction of the Earth’s axis in space. It is named after the American astronomer Seth Carlo Chandler (1846–1913). Geology and Earth Sciences The free oscillation of the Earth’s pole of rotation, discovered in 1891 by the American astronomer Seth Carlo Chandler (1846–1913). This wobble in the Earth’s rotation has a 435-day periodicity and appears to have a decay time of the order of 40 years. The cause (excitation) is unknown: atmospheric effects appear to be on too short a timescale; earthquake activity has been proposed, but has not been established. The major cause appears to be related to the Earth’s core and its magnetic coupling with the lower mantle. In 2005 the wobble changed phase by 180°.
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