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1
Polar Motion Animation 1973-2012
Polar Motion Animation 1973-2012
::2012/08/13::
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2
Extreme Weather - TORNADO, Climate Change and Chandler
Extreme Weather - TORNADO, Climate Change and Chandler's Wobble
::2012/02/29::
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3
Climate Change Update ( 01 March 2011 )
Climate Change Update ( 01 March 2011 ) 'Chandler's Wobble' May Usher in a New Ice Age
::2011/03/01::
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4
Chandler
Chandler's Wobble - Bokito Song
::2009/05/13::
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5
The 2012 Enigma - New in March 2008 Pt 9 of 10
The 2012 Enigma - New in March 2008 Pt 9 of 10
::2008/08/03::
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6
the white t gurls 2 doin a diff version of wobble.... no rude comments!!!
the white t gurls 2 doin a diff version of wobble.... no rude comments!!!
::2012/03/14::
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7
& THE I.V.Y. GROWS OV:ER THE DOOR
& THE I.V.Y. GROWS OV:ER THE DOOR
::2011/10/20::
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8
The Wobble with family
The Wobble with family
::2013/12/30::
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9
Toddler Wobble
Toddler Wobble
::2013/06/02::
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10
wobble baby
wobble baby
::2014/01/16::
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11
Wobble by GVSU West B
Wobble by GVSU West B
::2013/04/01::
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12
titty wobble
titty wobble
::2011/08/20::
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13
Proof of Earth Wobble - Response to Neo Terra - Updated
Proof of Earth Wobble - Response to Neo Terra - Updated
::2014/06/02::
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14
Wobble Beat
Wobble Beat
::2011/04/04::
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15
Meditation Music - Bliss Bag
Meditation Music - Bliss Bag
::2012/01/16::
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16
Wobble chair fun at Hutch Chiropractic
Wobble chair fun at Hutch Chiropractic
::2013/05/08::
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17
wobble?
wobble?
::2012/10/05::
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18
XK - Wobble Dubstep
XK - Wobble Dubstep
::2012/01/13::
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19
Weebles wobble but they don
Weebles wobble but they don't fall down!
::2013/04/20::
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20
the wobble
the wobble
::2011/06/20::
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21
David Wilcock ~ The 2012 Enigma ~ Full Version
David Wilcock ~ The 2012 Enigma ~ Full Version
::2012/09/08::
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22
03 - Asian Tsunami - McNeil-Lehrer - 20041227
03 - Asian Tsunami - McNeil-Lehrer - 20041227
::2008/10/24::
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23
WOBBLE HA!
WOBBLE HA!
::2012/04/01::
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24
The 2012 Enigma by David Wilcock Pt. 01
The 2012 Enigma by David Wilcock Pt. 01
::2011/03/07::
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25
WOBBLE TV Cubist LIVE @ WOBBLE June 2012
WOBBLE TV Cubist LIVE @ WOBBLE June 2012
::2012/07/12::
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26
The 2012 Enigma by David Wilcock Pt. 03
The 2012 Enigma by David Wilcock Pt. 03
::2008/03/14::
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27
The 2012 Enigma by David Wilcock Pt. 02
The 2012 Enigma by David Wilcock Pt. 02
::2008/03/14::
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28
The 2012 Enigma by David Wilcock Pt. 07
The 2012 Enigma by David Wilcock Pt. 07
::2008/03/14::
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29
The 2012 Enigma by David Wilcock Pt. 05
The 2012 Enigma by David Wilcock Pt. 05
::2008/03/15::
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30
MY DJs: DJ Tony T teaches Wobble at Petco Park
MY DJs: DJ Tony T teaches Wobble at Petco Park
::2013/08/20::
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31
The 2012 Enigma by David Wilcock Pt. 04
The 2012 Enigma by David Wilcock Pt. 04
::2008/03/14::
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32
Patch Adams - End of Capitalism - Revolution of Love
Patch Adams - End of Capitalism - Revolution of Love
::2011/10/20::
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33
The 2012 Enigma by David Wilcock Pt. 10
The 2012 Enigma by David Wilcock Pt. 10
::2008/03/15::
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34
The 2012 Enigma by David Wilcock Pt. 06
The 2012 Enigma by David Wilcock Pt. 06
::2008/03/14::
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35
wedding party doing the wobble
wedding party doing the wobble
::2014/05/28::
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36
Extreme Weather Caused By Prophetic Earth wobble
Extreme Weather Caused By Prophetic Earth wobble
::2014/01/10::
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37
The 2012 Enigma by David Wilcock Pt. 08
The 2012 Enigma by David Wilcock Pt. 08
::2008/03/15::
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38
WIGGLE WOBBLE-LES COOPER & THE SOUL ROCKERS
WIGGLE WOBBLE-LES COOPER & THE SOUL ROCKERS
::2014/06/27::
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39
Jeff Diamond interviews Holly Chandler and Peanut
Jeff Diamond interviews Holly Chandler and Peanut
::2014/05/30::
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40
Parker doing the wobble on cruise
Parker doing the wobble on cruise
::2013/10/22::
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41
Ron Chandler, "I Am the Paradigm Shift"
Ron Chandler, "I Am the Paradigm Shift"
::2014/03/04::
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42
188 DAYS by LUCUS Trailer
188 DAYS by LUCUS Trailer
::2011/11/13::
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43
NaSa QuaKe - Destruction Montage Trailer - By Rayzon
NaSa QuaKe - Destruction Montage Trailer - By Rayzon
::2012/01/05::
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44
Earth Wobble Cause of Sinkholes, Disasters & Synthia in Gulf Mutating
Earth Wobble Cause of Sinkholes, Disasters & Synthia in Gulf Mutating
::2012/11/15::
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45
JOHN CHANDLER -- 2015 -- VARSITY STARTING GOALIE- WESTVIEW HS
JOHN CHANDLER -- 2015 -- VARSITY STARTING GOALIE- WESTVIEW HS
::2014/03/29::
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46
Patrick Chandler Tempe Improv
Patrick Chandler Tempe Improv
::2014/03/27::
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47
Chandler
Chandler's Transcontinental RailRoad Documentary
::2014/03/26::
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48
Earth Wobble causes BLENDING Seasons  2
Earth Wobble causes BLENDING Seasons 2
::2012/01/27::
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49
Beasty Productions - Skanky-Stank Wobble! My dubbed video! Hilarious!
Beasty Productions - Skanky-Stank Wobble! My dubbed video! Hilarious!
::2013/10/23::
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50
Prophecy Of The Hidden Kali Yuga Avatar - Lord Chaitanya
Prophecy Of The Hidden Kali Yuga Avatar - Lord Chaitanya
::2011/05/16::
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RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
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The Chandler wobble is a small deviation in the Earth's axis of rotation relative to the solid earth,[1] which was discovered by American astronomer Seth Carlo Chandler in 1891. It amounts to change of about 9 metres (30 ft) in the point at which the axis intersects the Earth's surface and has a period of 433 days.[2][3] This wobble, which is a nutation, combines with another wobble with a period of one year, so that the total polar motion varies with a period of about 7 years.

The Chandler wobble is an example of the kind of motion that can occur for a spinning object that is not a sphere; this is called a free nutation. Somewhat confusingly, the direction of the Earth's spin axis relative to the stars also varies with different periods, and these motions—caused by the tidal forces of the Moon and Sun—are also called nutations, except for the slowest, which are precessions of the equinoxes.

Predictions[edit]

The existence of Earth's free nutation was predicted by Isaac Newton in Corollaries 20 to 22 of Proposition 66, Book 1 of the Philosophiæ Naturalis Principia Mathematica, and by Leonhard Euler in 1755 as part of his studies of the dynamics of rotating bodies. Based on the known ellipticity of the Earth, Euler predicted that it would have a period of 305 days. Several astronomers searched for motions with this period, but none was found. Chandler's contribution was to look for motions at any possible period; once the Chandler wobble was observed, the difference between its period and the one predicted by Euler was explained by Simon Newcomb as being caused by the non-rigidity of the Earth. The full explanation for the period also involves the fluid nature of the Earth's core and oceans—the wobble, in fact, produces a very small ocean tide with an amplitude of approximately 6 mm, called a "pole tide", which is the only tide not caused by an extraterrestrial body. Despite the small amplitude, the gravitational effect of the pole tide is easily detected by the superconducting gravimeter.[4]

Attempts at measurement[edit]

The International Latitude Observatories were established in 1899 to measure the wobble; incidentally, the wobble is also called the variation of latitude. These provided data on the Chandler and annual wobble for most of the 20th century, though they were eventually superseded by other methods of measurement. Monitoring of the polar motion is now done by the International Earth Rotation Service.

The wobble's amplitude has varied since its discovery, reaching its largest size in 1910 and fluctuating noticeably from one decade to another.

In 2009, Malkin & Miller's analysis of International Earth Rotation and Reference Systems Service (IERS) Pole coordinates time series data from January 1946 to January 2009 showed three phase reversals of the wobble, in 1850, 1920, and 2005.[2]

While it has to be maintained by changes in the mass distribution or angular momentum of the Earth's outer core, atmosphere, oceans, or crust (from earthquakes), for a long time the actual source was unclear, since no available motions seemed to be coherent with what was driving the wobble.

Theories[edit]

One promising theory for the source of the wobble was proposed in 2001 by Richard Gross at the Jet Propulsion Laboratory managed by the California Institute of Technology. He used angular momentum models of the atmosphere and the oceans in computer simulations to show that from 1985 to 1996, the Chandler wobble was excited by a combination of atmospheric and oceanic processes, with the dominant excitation mechanism being ocean‐bottom pressure fluctuations. Gross found that two-thirds of the "wobble" was caused by fluctuating pressure on the seabed, which, in turn, is caused by changes in the circulation of the oceans caused by variations in temperature, salinity, and wind. The remaining third is due to atmospheric fluctuations.[5]

See also[edit]

  • Carter, B. and M. S. Carter, 2003, "Latitude, How American Astronomers Solved the Mystery of Variation," Naval Institute Press, Annapolis.
  • Gross, Richard S., 2000, "The Excitation of the Chandler Wobble", Geophysical Research Letters, vol. 27 (15), pp. 2329–2332.
  • Lambeck, Kurt, 1980, The Earth's Variable Rotation: Geophysical Causes and Consequences (Cambridge Monographs on Mechanics), Cambridge University Press, London.
  • Munk, W. H. and MacDonald, G. J. F., 1960, The Rotation of the Earth, Cambridge University Press, London.
  • Moritz, H. and I.I. Mueller, 1987, Earth Rotation: Theory and Observation, Continuum International Publishing Group, London.

External links[edit]

References[edit]

  1. ^ e.g. Mueller, I.I., Spherical and Practical Astronomy as Applied to Geodesy, 1969, Frederick Ungar Publishing, NY, pp. 80.
  2. ^ a b Zinovy Malkin and Natalia Miller (2009). "Chandler wobble: two more large phase jumps revealed". arXiv. arXiv. Retrieved 16 July 2014. 
  3. ^ "Earth's Chandler Wobble Changed Dramatically in 2005". MIT Technology Review. MIT Technology Review. 2009. Retrieved 25 July 2013. 
  4. ^ See, e.g., Fig. 2.3. Virtanen, H. (2006). Studies of Earth Dynamics with the Superconducting Gravimeter. Academic Dissertation at the University of Helsinki. Retrieved September 21, 2009. 
  5. ^ {{Cite journal Some scientists predicts the last wobble to have happed nearly 4000 to 7500 years back during with there was dramatic change in pattern of Monsoons in the north Africa. The researchers claims that it has transformed the Great Saharan Desert into more greener territory. Further the expect the wobble to happen once in nearly 20000 years and which means then next can be expected after a period of 16000 years. However these estimates are short compared to the life of earth. | last = Gross | first = Richard S. | year = 2000 | title = The Excitation of the Chandler Wobble | journal = Geophysical Research Letters | volume = 27 | issue = 15 | pages = 2329–2332 | url = http://www.agu.org/pubs/crossref/2000/2000GL011450.shtml | accessdate = January 17, 2011 | doi=10.1029/2000gl011450 }}
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