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Topic: Polar motion

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	Polar bond head - Patent 5330089
		Motion of the radius and theta portions of the polar coordinate motions are monitored by sensors S.sub.2 and S.sub.1, respectively.
		The radius dimension of the polar coordinates is made much larger than the specified theta motion to limit the required theta angle and clearance between coil 14a and 15a to their field magnets 14b and 15b, respectively, such that there is no contact required during theta and radius polar motions.
		The radius dimension of the polar coordinates is made much larger than the specified theta angular motion to limit the required theta angle, and clearances between coil 14a and 15a to their field magnets 14b and 15b, respectively, such that there is no contact during required theta and radius polar motions.
	www.freepatentsonline.com /5330089.html (3099 words)

	Polar motion
		The motion of the rotation axis of the earth relative to the crust has three major components.
		The residual motion in the lower part of the figures includes irregularities with recurrence times ranging from days to years that are forced by the atmosphere.
		Polar motion has diurnal and semi-diurnal variations with amplitudes of a fraction of millisesond of arc (mas) that are due to the oceanic tides.
	www.iers.org /iers/earth/rotation/polmot/polmot.html (184 words)

	Polar motion - Wikipedia, the free encyclopedia
		Polar motion is the movement of Earth's rotation axis across its surface.
		The two periodic parts are a more or less circular motion called Chandler wobble with a period of about 435 days, and a yearly circular motion.
		The slow westward drift, about 20 m since 1900, is partly due to motions in the Earth's core and mantle, and partly to the redistribution of water mass as the Greenland ice sheet melts, and to isostatic rebound, i.e.
	en.wikipedia.org /wiki/Polar_motion (391 words)

	Polar Low Forecasting (Site not responding. Last check: 2007-10-14)
		The small size of the polar low and the strong curvature might lead one to reach the conclusion that significant wave development would be fetch-limited.
		Because polar lows generally develop well behind synoptic systems, they are likely to have a moderate steering flow above them and thus may move faster than the initiating low (which may have slowed down or stalled).
		Polar lows making landfall or moving over an ice surface will rapidly weaken as their source of energy is cut off.
	meted.ucar.edu /norlat/snow/polarlows/1.3_devofpolarlow.htm (1417 words)

	Poleshifts (2)
		polar wander: a change in the location of the geographic poles and equator caused by the entire earth, or its outer shell, moving relative to the spin axis, whose inclination remains unchanged.
		Throughout the 19th and early 20th centuries, polar wandering was frequently invoked to explain the evidence for former higher temperatures in the polar regions and former ice sheets at low latitudes.
		It is true that the polar motion record collected by the International Latitude Service (ILS) since 1900 indicates that in addition to the 14-month Chandler wobble and the 12-month annual wobble, the rotation pole has a secular drift of about 0.95° per million years towards eastern Canada.
	ourworld.compuserve.com /homepages/dp5/pole2.htm (8289 words)

	Polar Axis and Tilt \| World of Earth Science
		The polar axis is an imaginary line that extends through the north and south geographic poles.
		The tilt of the polar axis is principally responsible for variations in solar illumination (insolation) that result in the cyclic progressions of the seasons.
		Annual changes in the orientation of the polar axis relative to the Sun result in the apparent movement of the path of the Sun (the ecliptic) across the celestial sphere.
	www.bookrags.com /research/polar-axis-and-tilt-woes-02 (627 words)

	Polar Low Forecasting (Site not responding. Last check: 2007-10-14)
		Cold air vortices and polar lows are not an uncommon occurrence in the Labrador Sea and southern sections of the Davis Strait and the northern Gulf of Alaska.
		Deep convection and polar lows start to form as the air reaches areas with sea surface temperatures of more than 2°C. Polar lows are thus mainly found in the areas east of the 0° meridian, west of 40° east, and south of 75° north, with some cases in the area southwest of Spitsbergen.
		Polar lows are rare east of 40 degrees east, mainly because of the low sea surface temperatures, but some cases have been recorded off the southwestern tip of Novaya Zemlya.
	meted.ucar.edu /norlat/snow/polarlows/print_whole.htm (12195 words)

	Polar coordinate system - Wikipedia, the free encyclopedia
		In mathematics, the polar coordinate system is a two-dimensional coordinate system in which points are given by an angle and a distance from a central point known as the pole (equivalent to the origin in the more familiar Cartesian coordinate system).
		The equation of a curve expressed in polar coordinates is known as a polar equation, and is usually written with r as a function of θ.
		Polar coordinates can also be extended into three dimensions using the coordinates (ρ, φ, θ), where ρ is the distance from the pole, φ is the angle from the z-axis (called the colatitude or zenith and measured from 0 to 180°) and θ is the angle from the x-axis (as in the polar coordinates).
	en.wikipedia.org /wiki/Polar_coordinates (1752 words)

	Earth Rotation and Equatorial Coordinates
		The dominant motion is the precession of the earth's polar axis around the ecliptic pole, mainly due torques on the earth cause by the moon and sun.
		Because of internal motions and shape deformations of the earth, an axis defined by the locations of a set of observatories on the surface of the earth is not fixed with respect to the rotation axis which defines the celestial pole.
		The dominant component of polar motion, called Chandler wobble, is a roughly circular motion of the IRP around the celestial pole with an amplitude of about 0.7 arcseconds and a period of roughly 14 months.
	www.cv.nrao.edu /~rfisher/Ephemerides/earth_rot.html (2028 words)

	Chris Pack, 99 Cerebral Cortex
		Figure 2 illustrates the mapping of expansion and circular motions from Cartesian (x,y) coordinates onto the log polar radial coordinate (log r) and angular coordinate (q) of primary visual cortex.
		These log polar motion directions are proposed to be spatially integrated by MSTd cells in a manner similar to that envisioned by the template model (Figure 3).
		An alternative possibility is that a separate population of MSTd cells is selective to visual motion resulting from movement of the observer in the frontoparallel plane; that is, a plane in front of an observer that is perpendicular to the ground plane.
	cns-web.bu.edu /Profiles/Grossberg/GroMinPac99.html (13634 words)

	Major Anomly In Chandler's Wobble - 2005/2006 (via CobWeb/3.1 planetlab2.isi.jhu.edu) (Site not responding. Last check: 2007-10-14)
		There is relative motion in the wobble on both the X and Y dimensions, though a lot less on the Y Axis than would have been appropriate for the old wobble cycle.
		Normally at this time in the spiral motion of the wobble, the track of the moving Spin Axis would be moving to the right hand of the graphs of polar motion.
		The current spiral of polar motion (the track of the changing location of the Spin Axis in its regular 14 month wobble around its average location) has abruptly made a 90 degree "turn" to create a very small or tight "turn" in the spiral of the daily plot of the motion of the Spin Axis.
	www.michaelmandeville.com.cob-web.org:8888 /earthmonitor/polarmotion/2006_wobble_anomaly.htm (9160 words)

	Mayan Majix - Polar Motion Is Unsteady & Looks Deeply Anomalous At The Moment
		The anomalous motion in the location of the Spin Axis which I have been remarking upon is continuing.
		Comparison of X MIN phases during the last 100 years quickly demonstrates that the X MIN motion is the least regular motion of the spin axis.
		There is a resistance to a smooth and regular motion in the wobble.
	www.mayanmajix.com /art2182.html (1013 words)

	Products: Overview (Site not responding. Last check: 2007-10-14)
		This back-illuminated graphic is brought to life by polar motion, which adds a very realistic flowing water effect to the stream in the background.
		Polar Motion can be added to a variety of static graphics to simulate pouring, flowing, bubbling and other dynamic effects.
		Exciting neon motion is effective in cutting through the clutter to get your brand noticed.
	www.everbrite.com /products/indoor/motion.html (294 words)

	POLAR MOTION (Site not responding. Last check: 2007-10-14)
		The motion of the rotation axis of the Earth relative to the crust is coordinated by the Earth Orientation Parameter x and y.
		Figure 3 and Figure 4 show a decomposition of the x and y coordinates of the pole since 1890 into a trend, the seasonal and Chandler terms.
		This Table or this give coordinates of the mean rotation axis in the IERS Terrestrial Reference Frame, obtained by filtering the Chandler and seasonal terms, every years from 1900.
	hpiers.obspm.fr /eop-pc/earthor/polmot/pm.html (238 words)

	From the Cover: Twentieth century sea level: An enigma -- Munk 99 (10): 6550 -- Proceedings of the National Academy of ...
		Motion of the pole of rotation in milliarcseconds (mas) and in meters; x toward Greenwich and y toward 90° west of Greenwich (27, 28).
		With regard to the polar wander, the Peltier and Lambeck estimates are in rough accord for the case of zero sea level rise:
		Equivalent units of polar motion are 1 m/cy = 0.090° latitude/My = 0.32 milliarcseconds/y.
	www.pnas.org /cgi/content/full/99/10/6550 (3475 words)

	Mayan Majix - Earth Changes Bulletin Update As Of February 22 2006
		As well, it is likely that graphs of polar motion during the next 10 months will demonstrate that a relatively large shift has occurred in the average location of the Spin Axis.
		The latest graphs from the IERS (International Earth Rotation Service), which is the only authoritative source of information on the motions of the poles (and earth’s crust) shows a reversal of the path which the Spin Axis took during November-December, when the current anomaly began.
		Normally at this time in the spiral motion of the wobble, the track of the moving Spin Axis would be moving to the right hand of the graphs of polar motion, (see the Wobble Tracker graph below).
	www.mayanmajix.com /art2308.html (3974 words)

	Measuring Polar Motion with GPS (Site not responding. Last check: 2007-10-14)
		As the use of GPS has become more widespread, it has been applied to the problem of measuring polar motion.
		It has increased the accuracy of real-time polar motion data by a factor of four over the last several years.
		The following is a paper describing improvements to the polar motion data in the IERS Bulletin A. It attributes the improvements in the real-time data to the use of GPS.
	ccar.colorado.edu /~rla/gps.html (224 words)

	The effect of global seismicity on the polar motion of a viscoelastic Earth
		We evaluate the polar drift of a stratified viscoelastic Earth, generated by 20 years of global seismicity (from the Centroid Moment Tensor catalog, 1977–1997).
		We conclude, nevertheless, that global seismic activity is not able to alter significantly the rotational parameters of the Earth: according to our computations, the changes that it induces in the inertia tensor result in an average polar drift that is still significantly smaller than the observed one.
		Citation: Soldati, G. Boschi, A. Piersanti, and G. Spada (2001), The effect of global seismicity on the polar motion of a viscoelastic Earth, J.
	www.agu.org /pubs/crossref/2001/2000JB900354.shtml (208 words)

	Polar Motion Data of International Polar Motion Service
		Acting as the international polar motion measurement service(IPMS), this international joint measurement of longitude and latitude was carried out from 1962 to 1988.
		The coordinate values of polar motion(X, Y) and the change in the length of one day(L/D) were measured in this file.
		The IPMS central station(Mizusawa) recorded this data using diurnal values with the units of angular second and microseconds of time.
	gcmd.gsfc.nasa.gov /records/GCMD_NAOMIZI-2.html (114 words)

	Automated Quantification of Myocardial Ischemia and Wall Motion Defects by Use of Cardiac SPECT Polar Mapping and ...
		In LV polar map, anterior (ANT) wall is at top, septal (SEP) wall is at left, inferior (INF) wall is at bottom, lateral (LAT) wall is at right, apex is at center, and base is at circumference.
		Polar maps show perfusion, defect extent, wall thickening, and segmental scoring of perfusion defect severity.
		In blood-pool SPECT, the endocardial surfaces of both the LV and the RV are surface rendered as shown in Figure 17.
	tech.snmjournals.org /cgi/content/full/34/1/3 (4938 words)

	polar motion concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-14)
		polar motion concept from the Astronomy knowledge base
		Next axis motion: precession Up: axis motion Previous axis motion: nutation
		has definition The irregularly varying motion of the Earth's pole of rotation with respect to the Earth's crust.
	www.site.uottawa.ca:4321 /astronomy/polarmotion.html (52 words)

	POLAR MOTION - A PROPHECY - THE SCIENCE (via CobWeb/3.1 planetlab2.isi.jhu.edu) (Site not responding. Last check: 2007-10-14)
		It is becoming increasingly obvious that the much heralded prophecy of the shift in the poles for the millennial period actually did begin in December 1998 and is proceeding at a faster and faster rate, though still at a snail's pace.
		In December 1998 a decided dent in Chandler's Wobble can be seen (in the circular plot) and the Wobble has gotten stranger and stranger since then, its average motion seems to be accelerating the drift of the Wobble down the Y axis at a speed four times greater than before.
		By aligning dust grains or diverting the paths of electrons, for example, a magnetic field can effect the emission of polarized radio waves or skew the polarization of light passing through a region of space, rather like a weak pair of polarizing sunglasses.
	www.greatdreams.com.cob-web.org:8888 /motion.htm (2566 words)

	[IGSMAIL-2022] IAU Colq. 178 -- Polar Motion
		These new data, combined with a century of past observations, provide further information on the secular motion of the pole which, in turn, contributes to improved understanding of models for the Earth's interior.
		In 1962 the ILS was renamed the International Polar Motion Service (IPMS) and in 1988 the IPMS was discontinued when the International Earth Rotation Service commenced.
		Many of the questions which the ILS was organized to address still remain, including the enigmatic nature of the excitation and damping of polar motion.
	igscb.jpl.nasa.gov /mail/igsmail/1998/msg00249.html (866 words)

	Canadian Spatial Reference System - VLBI - Polar Motion
		Polar motion is a change in the earths orientation in relation to the spin axis.
		The earths mantle and crust form a very thin skin over the molten outer core.
		If we were to use VLBI observations to repeatedly measure the distance between 2 radio telescope located on different continents we could determine speed and direction in which they were moving relative to one another.
	www.geod.nrcan.gc.ca /geodesy/vlbi/vlbi04_e.php (199 words)

	Recalculated Polar Motion Data on Homogeneous System of International Latitude Service
		Acting as the international latitude measurement service(ILS), this international joint measurement of latitude was carried out from 1899 to 1978.
		This sytem is independent of the error in the positions of stars and the error in instrument constants.
		In this file, the coordinate values of polar motion(X, Y) have been recorded with the unit of angular second.
	gcmd.gsfc.nasa.gov /records/GCMD_NAOMIZI-1.html (131 words)

	Uniform Circular Motion
		Of course in general motion in two or three dimensions involves changes in speed as well as changes in the direction of
		There is however one type of motion in which only the direction of the velocity vector changes not its magnitude and this is uniform circular motion.
		Because we have uniform circular motion the polar angle
	www.pha.jhu.edu /~broholm/l5/node5.html (274 words)

	Clark R. Wilson - Geology - UT Austin
		Hinnov, L. and Wilson, C., An Estimate of the Water Storage Contribution to the Excitation of Polar Motion.
		Wilson, C., Excitation of Polar Motion in IAU Colloquium.
		Chen, J.L., C.R. Wilson, Hydrological Excitations of Polar Motion,1993 -2002, Geophys.
	www.geo.utexas.edu /faculty/wilson_pubs.htm (1571 words)

	Polar Express, The Easter Egg : Motion Capture Sessions for Hot Chocolate
		Polar Express, The Easter Egg : Motion Capture Sessions for Hot Chocolate
		Polar Express, The may have Slip-Ups on our companion site Slipups.com.
		click on the bell that appears to see the original motion capture sessions for hot chocolate.
	www.eeggs.com /items/47084.html (115 words)

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