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Topic: Gravity wave

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	Gravity Wave Interactions with the Diurnal Propagating Tide
		Gravity wave interactions are dependent on the vertical shear in the total background wind seen by the waves (Fritts and Vincent, 1987).
		A discrete gravity wave parameterization is utilized to represent the influences of gravity waves in the GSWM.
		The hybrid gravity wave parameterization relies upon the WKB approximation for a description of the vertical velocity perturbation of a gravity wave.
	www.cora.nwra.com /~meyer/THESIS/Ch3_Diurnal_Propagating_Tide.html (6187 words)

	Gravity Wave Detector (Site not responding. Last check: 2007-11-06)
		Gravity waves are undulations, or distortions in the fabric of space-time, caused by massive bodies in motion.
		As the gravity wave distorts (stretches or compresses) space, the ether stretches or compresses as well, thereby causing the speed of light to increase or decrease respectively.
		If a gravity wave is detected, a comparison of the signals from these detectors should show an inversion that is similar to the one illustrated in Figures 4 and 5.
	www3.telus.net /foamyether/gwd/detector.htm (1719 words)

	Gravity wave - Wikipedia, the free encyclopedia
		In the earth's atmosphere, gravity waves are important for transferring momentum from the troposphere to the mesosphere.
		Gravity waves are generated in the troposphere by frontal systems or by airflow over mountains.
		Gravity wave cloud pattern formed in the wake of the Île Amsterdam, a volcanic island in the southern Indian Ocean.
	en.wikipedia.org /wiki/Gravity_wave (280 words)

	AMS Glossary
		A plane gravity wave is characteristically composed of a pair of waves, the two moving in opposite directions with equal speed relative to the fluid itself.
		All waves of consequence on the ocean surface or interfaces are gravity waves, for the surface tension of the water becomes negligible at wavelengths of greater than a few centimeters (see capillary wave).
		Such waves have vertical accelerations that cannot be neglected in the vertical equation of perturbation motion.
	amsglossary.allenpress.com /glossary/search?id=gravity-wave1 (447 words)

	PCL: Gravity Waves (Site not responding. Last check: 2007-11-06)
		The gravity waves cause a "drag" on the polar front jet stream, which affects the development of cyclones and anticyclones and thus, the weather on the surface.
		Gravity waves can also modify the behaviour of the tides in the middle atmosphere and are responsible for the large departure of the middle atmosphere from radiative equilibrium.
		A gravity wave is an oscillation caused by the displacement of an air parcel which is restored to its initial position by gravity.
	pcl.physics.uwo.ca /pclhtml/gravitywaves.html (1284 words)

	GRAVITY WAVE DEFINED (Site not responding. Last check: 2007-11-06)
		To generate a gravity wave, the air must be forced to rise in STABLE air.
		In a gravity wave, the parcel of air will try to remain at a location in the atmosphere where there are no forces causing it to rise or sink.
		In a gravity wave, the upward moving region is the most favorable region for cloud development and the sinking region favorable for clear skies.
	www.theweatherprediction.com /habyhints/64 (539 words)

	Spaceflight Now \| Breaking News \| Gravity waves to open a 'completely new sense'
		Predicted by Einstein's theory of general relativity, gravity waves are expected to reveal, ultimately, previously unattainable mysteries of the universe.
		Gravity waves will provide information about our universe that is either difficult or impossible to obtain by traditional means.
		Gravitational waves are produced by the coherent bulk motion of matter, traveling nearly unscathed through space and time, and carrying the information of the strong field space-time regions where they were originally generated, be it the birth of a fl hole or the universe as a whole.
	spaceflightnow.com /news/n0211/05gravitywaves (951 words)

	[No title]
		I think it's generally accepted that gravity waves exist as they are such a fundamental facet of GR, the their nonexistance would turn the entire theory on it's head.
		Yes, in General Relativity, gravity is interpreted as a consequence of the curvature of spacetime by presense of mass-energy.
		Just like a wave propagating through water (think of ocean waves) is a change in the amplitude of the surface with time (at a given point), a gravitational wave is a change in the curvature of spacetime with time.
	arstechnica.com /journals/science.ars/2006/3/30/3397 (2100 words)

	SPACE.com -- Future Probes Will Try to Catch Gravity Waves
		Gravity waves are thought to be ripples in the fabric of space and time that are produced by violent cosmic events, such as colliding galaxies or exploding stars.
		No one yet has actually seen or measured gravity waves although two scientists, Joseph Taylor and Russel Hulse, were able to indirectly detect their influence by observing a pair of burned-out stars in orbit around each other.
		While LISA is working in space to look for large, low-frequency gravity waves produced by massive colliding objects, a separate set of Earth-based detectors will be hunting a different type of gravity wave from the ground.
	www.space.com /missionlaunches/missions/gravity_waves_000727.html (944 words)

	Catching a cosmic wave of gravity (Site not responding. Last check: 2007-11-06)
		A gravity wave is best thought of as a space-quake, easiest to detect when produced by something big like a supernova (a star's explosive collapse), a fl hole or the collision of two neutron stars.
		Gravity is the force produced by the clumps, distortions or movement within the fabric of space-time, usually depicted visually showing a massive object like the sun as a heavy ball dimpling the fabric of space-time.
		After nearly a century of debate about the existence of gravity waves, several decades of attempts at detecting them and years of painstaking preparation in the design and construction of LIGO, the search will soon be on.
	seattlepi.nwsource.com /local/72187_gravity28.shtml (1647 words)

	Ocean Wave Calculator
		The gravity and capillary buttons at the bottom of the calculator indicate whether you have computed a gravity or a capillary wave.
		The term gravity wave is used here to indicate that the restoring force in the wave is gravity.
		When the wavelength grows long with respect to the depth, the speed of the wave becomes dominated by the depth, approaching a value of sqrt(g*H), where g is the gravitational acceleration of 9.8 m/s/s and H is the depth in m.
	fermi.jhuapl.edu /wavecalc.html (762 words)

	Global Gravity Wave Weather
		While the impact of breaking gravity waves on the climatology of the middle atmosphere is well appreciated, far less is known about how shorter-term changes in weather-related gravity wave sources and local propagation environments affect the "weather" in the middle atmosphere.
		Waves were launched at z0 =1 km with ground-based phase speeds c = 0, 20 and 40 m s-1, a horizontal wavelength lx = 50 km, a peak initial horizontal velocity amplitude of u' = 0.2 m s-1 and an isotropic distribution of 8 initial propagation directions.
		Wave amplitudes were controlled using a wave action conservation equation with damping terms due to turbulent diffusion, infrared radiative cooling and wave breaking/saturation (Marks and Eckermann 1995).
	www.ips.gov.au /IPSHosted/STSP/meetings/aip/steve/steve.htm (3918 words)

	Gravity wave dynamics and effects in the middle atmosphere
		Atmospheric gravity waves have been a subject of intense research activity in recent years because of their myriad effects and their major contributions to atmospheric circulation, structure, and variability.
		Apart from occasionally strong lower-atmospheric effects, the major wave influences occur in the middle atmosphere, between ∼ 10 and 110 km altitudes because of decreasing density and increasing wave amplitudes with altitude.
		Progress includes a better appreciation of gravity wave sources and characteristics, the evolution of the gravity wave spectrum with altitude and with variations of wind and stability, the character and implications of observed climatologies, and the wave interaction and instability processes that constrain wave amplitudes and spectral shape.
	www.agu.org /pubs/crossref/2003/2001RG000106.shtml (342 words)

	GDC - About Us - Laser Interferometer Gravity Wave Detector
		Gravity waves cause the mirrors to move which modifies a tiny bit of the light.
		This light, which carries the gravity wave signal, is directed towards the output mirror, which reflects most of it back into the instrument.
		Linked together by computer the world gravity wave telescope will be able to listen in to 'sounds' from throughout the universe and pinpoint their direction.
	www.gdc.asn.au /grav_interf.php (236 words)

	Gravitational radiation - Wikipedia, the free encyclopedia
		In physics, a gravitational wave is a fluctuation in the curvature of space-time which propagates as a wave.
		The strongest gravitational waves we can expect to observe on Earth would be generated by very distant and ancient events in which a great deal of energy moved very violently (examples include the collision of two neutron stars, or the collision of two fl holes).
		In the case of the 4 kilometer arms of the LIGO gravitational wave detector, this is roughly one thousandth of the "diameter" of a proton.
	en.wikipedia.org /wiki/Gravitational_wave (3980 words)

	gravity wave - a Whatis.com definition (Site not responding. Last check: 2007-11-06)
		A gravity wave (or gravitational wave) is a ripple in the curvature of the space-time continuum (the enmeshed combination of our three perceived physical dimensions, plus time) created by the movement of matter.
		Long thought to exist, although never yet detected, gravity waves were first hypothesized in Albert Einstein's general theory of relativity, which predicted that an accelerating mass would radiate gravitational waves as it lost energy.
		If a gravitational wave were to pass through, the distance between the weights (which is measured by a laser beam moving back and forth between the mirrors and then recombined at a photodetector) would be altered.
	searchsmb.techtarget.com /gDefinition/0,294236,sid44_gci773187,00.html (581 words)

	Gravity Waves Retreat - 19 June to 6 July 2006
		A Gravity Waves Retreat covering the Lower and Upper Atmosphere Coupling was held at NCAR 19 June - 6 July 2006.
		Gravity waves play a central role in the coupling of the lower and upper atmosphere.
		The primary challenges to observational, numerical, and analytical studies are how to better quantify gravity wave excitation as related to various tropospheric processes, the global distribution of the wave sources, their propagation and breaking, and the multiscale interactions involving gravity waves in the UTLS and MLT regions.
	www.tiimes.ucar.edu /events/gw-retreat06.htm (497 words)

	Physics - Gravity
		Close to a planetary body the waves from the opposite end are blocked by the planet causing a change in the resultant interference pattern, or points of low and high vibration surrounding the body.
		For example, the bending of light by gravity could be explained by assuming that the aether increases in density as one nears the surface of a planetary body.
		The assumption that gravity is propagated at the speed of light leads to predictions that are in stark disagreement with observation.
	www.esotericscience.com /Gravity.aspx (2094 words)

	2004 Chapman Conference on Gravity Waves Processes and Parameterization
		Radar observations of mesospheric gravity waves, gravity wave/tide interactions: constraints on parameterization schemes, interactions between gravity waves and photochemistry in the mesopause region.
		Gravity waves and convective parameterizations, calculations of wave forcing and propagation from isolated convective sources, simulations of gravity wave excitation: implications for parameterization.
		Topographic gravity wave drag, topographic gravity wave drag, harmony of orographic, convective and spectral gravity-wave drag parameterizations.
	www.agu.org /meetings/cc04acall.html (1737 words)

	Pulsar find boosts hope for gravity-wave hunters
		Neutron star pairs may merge and give off a burst of gravity waves about six times more often than previously thought, says a team of scientists from Italy, Australia, the UK and the USA.
		If neutron star pairs merge this often, gravity-wave detectors being built now might be able to detect a burst of gravity waves every year or two, rather than about once a decade - the most optimistic prediction until now.
		Gravity waves were predicted by Einstein's general theory of relativity.
	www.physlink.com /News/120403PulsarGravity.cfm (682 words)

	Ripples in SpaceTime
		Predicted in Einstein's General Theory of Relativity, gravitational waves are disturbances in the curvature of spacetime caused by the motions of matter.
		The first test of Einstein's General Theory of Relativity (the bending of light by the gravity of a large mass, seen in a solar eclipse) was made by a team led by Sir Arthur Eddington, who became one of the strongest supporters of the new theory.
		For starters, gravitational waves, though weakening with distance, are thought to be unchanged by any material they pass through and, therefore, should carry signals unalt ered across the vast reaches of space.
	archive.ncsa.uiuc.edu /Cyberia/NumRel/GravWaves.html (605 words)

	ScienceDaily: Pulsar Find Boosts Hope For Gravity-wave Hunters
		Gravity Waves Analysis Opens "Completely New Sense" (October 30, 2002) -- Sometime within the next two years, researchers will detect the first signals of gravity waves -- those weak blips from the far edges of the universe passing through our bodies every second.
		Gravitational radiation -- In physics, in terms of a metric theory of gravitation, a gravitational wave is a fluctuation in the curvature of space-time which propagates as a...
		Gravity is the reason for the very existence of the earth, the sun and other celestial bodies; without it matter would not...
	www.sciencedaily.com /releases/2003/12/031204075049.htm (1908 words)

	Gravity Wave Text Published (Site not responding. Last check: 2007-11-06)
		Several years ago, ARL initiated a research program to address the issue, anticipating a future need to take such matters into account in the pollution dispersion and air quality forecasting models that were then under development.
		ARL efforts to address this matter originated as early as the 1960s, with the detection of gravity waves in the lower atmosphere by radar.
		"An Introduction to Atmospheric Gravity Waves" by Carmen J. Nappo (of the ARL Atmospheric Turbulence and Diffusion Division, in Oak Ridge, TN).
	www.arl.noaa.gov /pubs/news/gwave_102003.html (221 words)

	Big Spheres to Catch Gravity Waves
		LIGO will initially be tuned to pick up gravity waves in a narrow range of frequencies near 100 Hz, roughly the orbital frequency of a pair of neutron stars in the early stages of a merger.
		The outer shell would be most sensitive to gravitational waves with frequencies near 1 kHz, while the gravity wave resonance of the inner sphere would be 2 or3 kHz, depending on the materials.
		Oscillations induced in the two spheres by a passing gravity wave would be 180 degrees out of phase--one sphere would shrink slightly while the other expanded--causing tiny fluctuations in the gap width.
	focus.aps.org /story/v8/st3 (619 words)

	MLS Observations of Atmospheric Gravity Waves
		Gravity waves (GWs) play important roles in determining atmospheric general circulations and thermal structures [e.g., Lindzen, 1981; Holton, 1982].
		For limb-scan observations, the radiances are often truncated by 3-6 measurement points to meet the saturation criteria, which yields a horizontal scale of 50-100km.
		Over the wave conducting regions, longitudianl variations of wave activity contain valuable information on GW sources [McLandress et at, 2000; Jiang et al., 2002].
	mls.jpl.nasa.gov /jonathan (521 words)

	BOB LAZAR’S GRAVITY GENERATOR
		So if, by analogy, we assume that the gravitational wave is similarly structured to that of a sinusoidal electromagnetic wave (there is some evidence to suggest that gravity waves are structured as an electromagnetic wave).
		Of the two main types of structured “metallic lens” the M-plane alignment retards the em wave, and the E-plane alignment accelerates the wave (in the E-plane structure the metal strips are parallel to the plane of the electric field of the wave - as shown in the figure above).
		If, then, it can be controlled how the two waves are shaped, then it will also be possible to control their constructive and destructive interference pattern - and hence the strength or weakness of the electric field at the area where the two beams approach each other.
	www.gravitywarpdrive.com /Gravity_Generator.htm (1601 words)

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