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175.137.22.141: /* See also */

2014-12-17T09:27:17Z

See also

← Older revision		Revision as of 11:27, 17 December 2014
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	In [~~[geophysics]~~], the ~~'''free-air gravity anomaly'''~~, ~~often simply called the '''free~~-~~air anomaly'''~~, is the ~~measured [[gravity anomaly]] after~~ a ~~''free-air correction'' is applied to correct~~ for the ~~elevation at which a measurement is made. The free-air correction does so by adjusting these measurements~~ of ~~gravity to what would~~ have been ~~measured at sea level~~.<~~ref name=Fowler~~>{{cite book\|first=C.M.R.\|last=Fowler\|title=The Solid Earth: An Introduction to Global Geophysics\|year=2005\|edition=2\|publisher=[[Cambridge University Press]]\|location=[[Cambridge, UK]]\|isbn=0-521-89307-0\|pages=205–206}}<~~/ref~~>		following the first exposure MAX AIR palm revolutionized the configuration just before the cushioning, so the continuation of the major conclude of two yrs to make a corresponding improvements in the complete formerly unveiled SOLDIER four with pretty much the similar. Due to the fact LEB7 get started, LeBron's sneakers [http://En.Wiktionary.org/wiki/transformed transformed] to the ZOOM AIR MAX AIR, so his footwear ended up all connected to change the configuration, and try to obtain synchronization. This two-LBJ Ambassador III adjustments in visual appeal as quite a few, 5 / eight upper give the wearer a lot more overall flexibility, NIKE traction outsole method environment for exterior fields give additional have on and grip, these kinds of drastic reforms will also let LBJ Ambassador III known as the current industry basket of shoes have been produced in fantastic faith. <br><br>

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	~~The free-air gravity anomaly is given by the equation:<ref name=Fowler/~~>

	:<~~math~~>~~g_{F} = g_{obs} - g_\lambda + \delta g_F~~<~~/math~~>

	~~Here,~~ <~~math~~>~~g_F</math> is~~ the ~~free-air gravity anomaly~~, ~~<math>g_{obs}</math> is observed gravity~~, ~~<math>g_\lambda</math> is~~ the ~~correction for latitude~~ (~~because~~ the ~~Earth is not a perfect sphere~~), and <~~math~~>~~\delta g_F~~<~~/math~~> is the ~~free-air correction~~.

	~~[[Gravitational acceleration]] decreases as an [[inverse square law]] with~~ the ~~distance at which~~ the ~~measurement is made from~~ the ~~mass. The free air correction is calculated from Newton's Law, as a rate~~ of ~~change~~ of ~~gravity with distance:<ref name=Lillie>{{cite book\|first=R~~.J.\|last~~=Lillie\|title=Whole Earth Geophysics: An Introductory Textbook~~ for ~~Geologists and Geophysicists\|year=1998\|publisher=[[Prentice Hall]]\|isbn=0-13-490517-2}}~~<~~/ref~~>

	:<~~math~~>~~\begin{align} g &=\frac{GM}{R^2}\\~~
	~~\frac{dg}{dR} &= -\frac{2GM}{R^3}= -\frac{2g}{R} \end{align}</math>~~
	At the ~~equator, <math>2g/R = 0~~.~~3086<~~/~~math> mGal/m~~.

	~~The free-air correction is~~ the ~~amount that must be added to~~ a ~~measurement at height <math>h</math> to correct it to sea level:~~
	~~:<math>\delta g_F = \frac{2g}{R} \times h </math>~~.
	~~Here we have assumed that measurements are made relatively close~~ to the ~~earth's surface so that R doesn't vary significantly. Also~~, ~~there~~ is ~~an assumption that no mass exists between~~ the ~~observation point and sea level~~. ~~The [[Bouguer anomaly]] and terrain correction are used~~ to ~~account for this~~.

	~~==See also==~~
	* [[Earth's gravity]]

	~~==References==~~
	<~~references/~~>


	[~~[Category~~:~~Gravimetry~~]]
	~~{{geophysics~~-~~stub}}~~

en>Materialscientist: Reverted 1 good faith edit by 121.97.120.236 using STiki

2013-11-26T12:46:35Z

Reverted 1 good faith edit by 121.97.120.236 using STiki

← Older revision		Revision as of 14:46, 26 November 2013
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	~~Hello and welcome~~. My title is ~~Figures Wunder~~. ~~Doing ceramics~~ is ~~what adore doing~~. ~~Her family members lives in Minnesota. In her expert life she~~ is ~~a payroll clerk but she~~'s ~~usually needed her personal business~~.<br><br>Here is ~~my blog~~ [~~http://linktasti~~.cc/~~dietmealdelivery74619 linktasti.cc~~]		In [[geophysics]], the '''free-air gravity anomaly''', often simply called the '''free-air anomaly''', is the measured [[gravity anomaly]] after a ''free-air correction'' is applied to correct for the elevation at which a measurement is made. The free-air correction does so by adjusting these measurements of gravity to what would have been measured at sea level.<ref name=Fowler>{{cite book\|first=C.M.R.\|last=Fowler\|title=The Solid Earth: An Introduction to Global Geophysics\|year=2005\|edition=2\|publisher=[[Cambridge University Press]]\|location=[[Cambridge, UK]]\|isbn=0-521-89307-0\|pages=205–206}}</ref>

			==Anomaly==

			The free-air gravity anomaly is given by the equation:<ref name=Fowler/>

			:<math>g_{F} = g_{obs} - g_\lambda + \delta g_F</math>

			Here, <math>g_F</math> is the free-air gravity anomaly, <math>g_{obs}</math> is observed gravity, <math>g_\lambda</math> is the correction for latitude (because the Earth is not a perfect sphere), and <math>\delta g_F</math> is the free-air correction.

			[[Gravitational acceleration]] decreases as an [[inverse square law]] with the distance at which the measurement is made from the mass. The free air correction is calculated from Newton's Law, as a rate of change of gravity with distance:<ref name=Lillie>{{cite book\|first=R.J.\|last=Lillie\|title=Whole Earth Geophysics: An Introductory Textbook for Geologists and Geophysicists\|year=1998\|publisher=[[Prentice Hall]]\|isbn=0-13-490517-2}}</ref>

			:<math>\begin{align} g &=\frac{GM}{R^2}\\
			\frac{dg}{dR} &= -\frac{2GM}{R^3}= -\frac{2g}{R} \end{align}</math>
			At the equator, <math>2g/R = 0.3086</math> mGal/m.

			The free-air correction is the amount that must be added to a measurement at height <math>h</math> to correct it to sea level:
			:<math>\delta g_F = \frac{2g}{R} \times h </math>.
			Here we have assumed that measurements are made relatively close to the earth's surface so that R doesn't vary significantly. Also, there is an assumption that no mass exists between the observation point and sea level. The [[Bouguer anomaly]] and terrain correction are used to account for this.

			==See also==
			* [[Earth's gravity]]

			==References==
			<references/>


			[[Category:Gravimetry]]
			{{geophysics-stub}}

en>Torreslfchero: Reverted edit(s) by 24.188.18.89 identified as test/vandalism using STiki

2012-08-21T14:56:59Z

Reverted edit(s) by 24.188.18.89 identified as test/vandalism using STiki

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Hello and welcome. My title is Figures Wunder. Doing ceramics is what adore doing. Her family members lives in Minnesota. In her expert life she is a payroll clerk but she's usually needed her personal business.<br><br>Here is my blog [http://linktasti.cc/dietmealdelivery74619 linktasti.cc]