A Myster y o f Earth' s Wobbl e Solved : It's th e 1.2 years, meaning that it takes that amount of time to Ocea n complete one wobble. The amplitude of the wobble The century-old mystery of Earth's "Chandler amounts to about 20 feet at the North Pole. It has been wobble" has been solved by a scientist at NASA' s Jet calculated that the Chandler wobble would be damped Propulsion Laboratory in Pasadena, California. The down, or reduced to zero, in jus t 68 years, unless some Chandler wobble, named for its 1891 discoverer, Seth force were constantly acting to reinvigorate it. Carlo Chandler Jr., an American businessman turned But what is that force, or excitation mechanism? astronomer, is one of several wobbling motions exhib- Over the years, various hypotheses have been put for- ited by the Earth as it rotates on its axis, much as a top ward, such as atmospheric phenomena, continental wobbles as it spins. water storage (changes in snow cover, river runoff, Scientists have been particularly intrigued by the lake levels, or reservoir capacities), interaction at the Chandler wobble, since its cause has remained a mys- boundary of Earth's core and its
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Oct 1, 2000
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