Earth Radii - Factbites

Earth Radii - Factbites
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Topic: Earth Radii

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	Search Results for radii - Encyclopædia Britannica
		portion of the magnetosphere that rotates with the Earth at about four Earth radii (approximately 26,000 km, or 16,000 miles); beyond this region there is a rapid decrease in electron...
		A topological space satisfies the second axiom of countability if it has a countable basis—that is, interiors of circles with radii and centres represented by rational numbers.
		In a table listing surface temperatures, bolometric or total luminosities, and radii in terms of corresponding solar values for main-sequence stars ranging from very luminous objects to faint M-type...
	www.britannica.com /search?query=radii&submit=Find&source=MWTAB (344 words)

	Mathematical Explanation of Tides
		The distance of the Moon from that water molecule is only 59 earth radii away, while the center of the Earth is 60 earth radii away from the Moon.
		Effectively, if the Earth and Moon did not move, it would form a "hill of water" or "tidal bulge" at that location, due to the upward "excess acceleration" due to the Moon's gravitation and that lesser distance.
		There is also a factor regarding the Earth losing kinetic energy of rotation due to frictional heating of the ocean tides against the ocean bottoms and the continents.
	mb-soft.com /public/tides.html (2914 words)

	Alkaline Earth Metals
		Alkaline earth metals have large atomic radii in their respective periods, out sized only by the alkali earth metals because they have the second least amount of protons to pull on their electrons in their period.
		Alkaline earth metals are found in the Earth's crust, but they are usually found mixed rock structures.
		Alkaline Earth metals consist of elements 4, 12, 20, 38, 56, 88 Like the alkali metals, the alkaline earth metals have a shiny, slivery-white color.
	barbershop.simpletea.net /Chemistry%20Project/alkearth.html (2914 words)

	MU-Physics: Experiment of the Month #58
		The diagram shows the earth radius which leads to point A and another leading to point B. A little geometry shows that the difference between the shadow angles is the same as the angle between those two radii.
		The angle defined by the shadow is the same as the angle between a sun ray and a radius line of the earth.
		In the figure above right, a smaller segment of the spherical earth's surface is shown, with the light rays now shown as dotted lines.
	muweb.millersville.edu /~physics/exp.of.the.month/58 (1462 words)

	GLOBAL EXPANSION TECTONICS GLOBAL EXPANSION TECTONICS GLOBAL EXPANSION TECTONICS
		This, unfortunately, did not scientifically resolve the argument that modern oceanic magnetic isochron data may in fact be better modeled at reduced Earth radii.
		Development of the oceans, with increasing Earth radius, was considered to have commenced during the Mesozoic, after final dislocation of the continental fragments, due to widening of the main mid-oceanic fracture zones.
		Barnett's models were the first to emphasise the Earth's hemihedral asymmetry, the antipodal relation of continents and oceans, the greater separation of the southern continents and the northward migration of all continents (Carey, 1975) with respect to the rapidly expanding southern hemisphere.
	www.tmgnow.com /repository/global/expanding_earth.html (4950 words)

	Footprints by Dish Size - Definition of Geostationary (Geosynchronous), Polar, LEO, HEO, MEO, Sun Synchronous Orbits, Brief Satellite History
		More technically, a geostationary orbit is a circular prograde orbit in the equatorial plane with an orbital period equal to that of the earth; this is achieved with an orbital radius of 6.6107 (equatorial) earth radii, or an orbital height of 35786 km.
		Radarsat is in orbit 798 kilometres above the Earth, at an angle of inclination of 98.6 degrees to the equator as it circles the globe from north pole to south pole.
		While there are special orbits that are designed for specific purposes, three general classes of orbits have come into wide spread use for observations of the earth and for microwave communication with the earth: Geostationary orbits, low earth orbits, (LEOs) and polar orbits.
	www.geo-orbit.org /sizepgs/geodef.html (6827 words)

	radius
		The radius (plural radii, pronounced ray-dee-eye) of a circle or sphere is the distance from its center to the edge or periphery.
		The radius is the bone of the forearm that extends from the inside of the elbow to the thumb side of the wrist.
		The radius is situated on the lateral side of the ulna, which exceeds it in length and size.
	www.fact-library.com /radius.html (1372 words)

	methods_rare_earth_elements
		This method combines desolvating micro-nebulization with the ELEMENT for the analysis of all 14 stable rare earth elements (REEs) in small samples of marine particulate matter.Application is demonstrated for REEs in suspended particles from a deep ocean hydrothermal vent plume and a geological reference material.
		However, a systematic decrease in ionic radii as inner 4f electrons are filled with increasing atomic number (the "lanthanide contraction") leads to systematic differences in the elements' chemical properties, resulting in fractionation along the series during reaction and transport in the natural environment.
		The rare earth elements (REEs) comprise a coherent series of elements possessing generally similar chemical properties.
	marine.rutgers.edu /rial/methREEtext.htm (396 words)

	radcon97.dj.html
		The model assumes uniform reflectivity within a sampling volume, an effective Earth's radius of 4/3 the actual value, and Gaussian weighting functions in range, azimuth (with an equivalent beam width) and elevation (Doviak and Zrnic 1993).
		We also compute the circulation around and the areal expansion rate of "circles" of various radii centered on apparent vortex centers by bilinearly interpolating data to judiciously chosen points on the circles and using a line-integral method.
		The circulation and mean divergence do not vary appreciably as the radius increases from 1 to 3 km, indicating that the mature tornado was embedded in a region of fairly uniform strong convergence that was at least 6 km in diameter, and that the tornado was a contraction and spin-up of its parent mesocyclone.
	www.nssl.noaa.gov /swat/radcon97.dj.html (1617 words)

	AGU Web Site: A Beginner's Guide to the Earth's Magnetosphere
		The positively charged ions in this plasma drift westward around the Earth, and the negative electrons drift eastward, such that both contribute to a westward-directed ring of current that encircles the Earth at distances, typically, of several Earth radii.
		The magnetosphere is the region of space to which the Earth's magnetic field is confined by the solar wind plasma blowing outward from the Sun, extending to distances in excess of 60,000 kilometers from Earth.
		A shock wave also stands in the flow upstream of the cavity (in Figure 1), which forms because the speed of the solar wind relative to the Earth is much faster than that of wave propagation within it.
	www.agu.org /sci_soc/cowley.html (3002 words)

	APOD: 2002 November 25 - The Earth's Magnetic Field
		magnetic field lines out to two Earth radii, with blue lines directed inward and yellow lines directed outward.
		Earth's core should be able to damp the current
		The mystery is still being studied but recently thought related to motions in the Earth's liquid outer core.
	antwrp.gsfc.nasa.gov /apod/ap021125.html (143 words)

	AGU Web Site: A Beginner's Guide to the Earth's Magnetosphere
		Given a planetary "bar magnet" field that produces a field strength of about 30,000 nT at the Earth's surface at the equator, estimates place the boundary, called the magnetopause, at a geocentric distance of about 10 Earth radii on the upstream (day) side, and this is where it is generally observed.
		Most of the "geography" of the complex system that is the Earth's magnetosphere has been mapped out in the past 40 years of experimental study, but much remains to be learned about the underlying physical processes that are at work.
		This is a rather weak field, about one ten thousandth of the field at the Earth's surface, but nevertheless, it plays a crucial role in the Earth's interaction with the solar wind.
	www.agu.org /sci_soc/cowley.html (143 words)

	ISEE (International Sun-Earth Explorer)
		ISEE-3 was initially placed into an elliptical halo orbit about the L1 Lagrangian point — the first spacecraft to use such an orbit — 235 Earth-radii out on the sunward side of Earth, where it continuously monitored changes in the near-Earth interplanetary medium.
		A series of three spacecraft built and operated as a fleet by NASA and ESA (European Space Agency) to study the influence of the Sun on Earth’s space environment and magnetosphere.
		In conjunction with the ISEE-1 and ISEE-2 mother and daughter spacecraft, which had eccentric geocentric orbits, it explored the coupling and energy transfer processes between the incoming solar wind and Earth’s magnetosphere.
	daviddarling.info /encyclopedia/I/ISEE.html (299 words)

	NOAA's Coral Reef Data Discovery Glossary
		These two elements are found in the earth, the atmosphere, and all organisms
		Because the analogue signal from the detector of a scanner may be sampled at any desired interval, the picture element may be smaller that the ground resolution cell of the detector.
		With the raster data model, spatial data is not continuous but divided into discrete units.
	www.coris.noaa.gov /glossary/glossary_l_z.html (299 words)

	List of Project Pages
		The IPS Educational Pages contain a wealth of information about the sun; the solar cycle; the earth's magnetic field; the ionosphere; and the effects of space weather on technological and natural systems; as well as many more general topics.
		This page includes a current picture of the sun in H-alpha, A forcast of solar and geomagnetic activity, X-ray fluxes from the last 72 hours, geosynchronous magnetic field and electron and proton fluxes, and geomagnetic index data.
		Our principal objective is to develop an understanding of the physical processes which control the geospace environment, with particular interest in the observation of the low-energy or core plasma that originates in the ionosphere and has been found to supply plasma to the entire magnetosphere.
	www.iki.rssi.ru /magbase/REFMAN/YELLPAGE/project-pages-only.html (299 words)

	Dynamic Earth Home Page
		Visual Elements Periodic Table - 3D visualizations of the periodic table
		Web Elements - a periodic table with lots of useful data
		Mineral Structures Data Base - 3D models of mineral structures
	www.macalester.edu /geology/wirth/WirthLinks.html (299 words)

	ipedia.com: Magnetosphere Article
		On the sun's side of Earth, the magnetopause distance is approximately 10 Earth radii.
		Abreast of Earth the distance grows to about 15 earth radii (distances change with solar wind pressure and density; The magnetosphere is made to flap and compress by the solar wind) while on the night side it extends into a long cylindrical magnetotail at least several hundred radii long, gradually turning into a wake.
		Earth's field forms an obstacle to the solar wind, which confines its field lines and plasmas into an elongated cavity, known as Earth's magnetosphere.
	www.ipedia.com /magnetosphere.html (616 words)

	Society Fresh : Article 'Hipparchus (astronomer)'
		From the geometry of book 2 it follows that the Sun is at 2550 Earth radii, and the mean distance of the Moon is 60½ radii.
		According to Pappus, he found a least distance of 62, a mean of 67+1/3, and consequently a greatest distance of 72+2/3 Earth radii.
		This model described the apparent motion of the Sun fairly well (of course today we know that the planets like the Earth move in ellipses around the Sun, but this was not discovered until Johannes Kepler published his first two laws of planetary motion in 1609).
	www.society-fresh.net /DisplayArticleFull41630.html (7038 words)

	Roche Limit: Why Do Comets Break Up?
		Earth’s Roche limit for comets is 34,700 km or 5.43 radii and for asteroids, 19,000 km or 2.98 radii.
		Saturn’s limit for comets is 164.000 km or 2.72 radii and for asteroids is 90.200 km or 1.50 radii.
		Jupiter’s limit for comets is 242,000 km or 3.38 radii and for asteroids is 133,000 km or 1.86 radii.
	www.asterism.org /tutorials/tut25-1.htm (742 words)

	holes.txt
		It officially means the equatorial radii of the Earth vrs the polar radius for the Earth, and similarly for the Moon, and for all planets.
		The polar and equatorial radii of Jupiter are the limits to which this focus window flexes in cross sectional diameter.
		The second accord is with Jupiter closest to the Sun (perihelion) and Earth farthest from the Sun (aphelion) to reveal that the EQUATORIAL diameter of Jupiter is the hallmark of 'holes' for this array.
	www.cosmicastronomy.com /holes.txt (742 words)

	AGU Web Site: A Beginner's Guide to the Earth's Magnetosphere
		Given a planetary "bar magnet" field that produces a field strength of about 30,000 nT at the Earth's surface at the equator, estimates place the boundary, called the magnetopause, at a geocentric distance of about 10 Earth radii on the upstream (day) side, and this is where it is generally observed.
		This field collapse often induces the onset of reconnection in the tail at distances of 20–40 Earth radii as it propagates downtail.
		The magnetosphere is the region of space to which the Earth's magnetic field is confined by the solar wind plasma blowing outward from the Sun, extending to distances in excess of 60,000 kilometers from Earth.
	www.agu.org /sci_soc/cowley.html (3002 words)

	Project NOVA
		Since the angle between the two plumb lines is also the angle between the Earth's radii to the two points, it is logical that the circumference of the Earth (a great circle passing through those two points) is approximately
		It is indicated, in practice by a carpenter's "plumb line." Since the Earth is a sphere, however, the perpendicular to the Earth's surface at a point is co-directional with the Earth's radius at that point.
		Accurate measurements have shown that if the plumb lines at two different places A and B differ in direction by one degree, then the distance measured along the surface of the Earth between A and B is about 69 land miles.
	www.uncfsu.edu /msec/nova/timmod1e.htm (376 words)

	Footprints by Dish Size - Definition of Geostationary (Geosynchronous), Polar, LEO, HEO, MEO, Sun Synchronous Orbits, Brief Satellite History
		More technically, a geostationary orbit is a circular prograde orbit in the equatorial plane with an orbital period equal to that of the earth; this is achieved with an orbital radius of 6.6107 (equatorial) earth radii, or an orbital height of 35786 km.
		Radarsat is in orbit 798 kilometres above the Earth, at an angle of inclination of 98.6 degrees to the equator as it circles the globe from north pole to south pole.
		While there are special orbits that are designed for specific purposes, three general classes of orbits have come into wide spread use for observations of the earth and for microwave communication with the earth: Geostationary orbits, low earth orbits, (LEOs) and polar orbits.
	www.geo-orbit.org /sizepgs/geodef.html (6827 words)

	Footprints by Dish Size - Definition of Geostationary (Geosynchronous), Polar, LEO, HEO, MEO, Sun Synchronous Orbits, Brief Satellite History
		More technically, a geostationary orbit is a circular prograde orbit in the equatorial plane with an orbital period equal to that of the earth; this is achieved with an orbital radius of 6.6107 (equatorial) earth radii, or an orbital height of 35786 km.
		Radarsat is in orbit 798 kilometres above the Earth, at an angle of inclination of 98.6 degrees to the equator as it circles the globe from north pole to south pole.
		While there are special orbits that are designed for specific purposes, three general classes of orbits have come into wide spread use for observations of the earth and for microwave communication with the earth: Geostationary orbits, low earth orbits, (LEOs) and polar orbits.
	www.geo-orbit.org /sizepgs/geodef.html (6827 words)

	Footprints by Dish Size - Definition of Geostationary (Geosynchronous), Polar, LEO, HEO, MEO, Sun Synchronous Orbits, Brief Satellite History
		More technically, a geostationary orbit is a circular prograde orbit in the equatorial plane with an orbital period equal to that of the earth; this is achieved with an orbital radius of 6.6107 (equatorial) earth radii, or an orbital height of 35786 km.
		Radarsat is in orbit 798 kilometres above the Earth, at an angle of inclination of 98.6 degrees to the equator as it circles the globe from north pole to south pole.
		While there are special orbits that are designed for specific purposes, three general classes of orbits have come into wide spread use for observations of the earth and for microwave communication with the earth: Geostationary orbits, low earth orbits, (LEOs) and polar orbits.
	www.geo-orbit.org /sizepgs/geodef.html (6827 words)

	SPARTAN 201-3: The Corona
		The earth, our home planet, is located at a distance of about 200 solar radii from the visible surface of the Sun.
		The dimension of a solar radius is roughly 700,000 km, approximately twice the distance from the earth to the Moon, and the solar radius is a convenient scale for discussing the solar corona, and the heliosphere, the extension of the solar atmosphere into interplanetary and interstellar space.
		Even with this development, there are practical limitations to ground-based observing of the solar corona imposed by the scattering of light by both dust and molecules in the earth's atmosphere, as the brightness of the white light corona ranges from one millionth to one billionth of the central solar disk brightness.
	umbra.nascom.nasa.gov /spartan/the_corona.html (1728 words)

	Note
		The computation began with a mean lunar distance from the Earth’s centre of 1187379440 Paris feet, equivalent to the value of 60.4 Earth-radii.
		Lastly, to find the distance which an object on Earth would fall in one second, a scaling adjustment was applied of 60.4 Earth-radii, as before.
		This factor represents the full lunar distance without any baricentre correction, as was applied earlier in the computation, which is fair enough.
	www.ucl.ac.uk /sts/nk/newtonmoontest.htm (1728 words)

	Footprints by Dish Size - Definition of Geostationary (Geosynchronous), Polar, LEO, HEO, MEO, Sun Synchronous Orbits, Brief Satellite History
		More technically, a geostationary orbit is a circular prograde orbit in the equatorial plane with an orbital period equal to that of the earth; this is achieved with an orbital radius of 6.6107 (equatorial) earth radii, or an orbital height of 35786 km.
		Radarsat is in orbit 798 kilometres above the Earth, at an angle of inclination of 98.6 degrees to the equator as it circles the globe from north pole to south pole.
		If the orbit is in the equatorial plane, and if rotation is in the same direction as the Earth, (rotating at the same angular velocity as the Earth) and it overflies the same point on the globe permanently then the satellite is termed geostationary.
	www.geo-orbit.org /sizepgs/geodef.html (1728 words)

	Footprints by Dish Size - Definition of Geostationary (Geosynchronous), Polar, LEO, HEO, MEO, Sun Synchronous Orbits, Brief Satellite History
		More technically, a geostationary orbit is a circular prograde orbit in the equatorial plane with an orbital period equal to that of the earth; this is achieved with an orbital radius of 6.6107 (equatorial) earth radii, or an orbital height of 35786 km.
		Radarsat is in orbit 798 kilometres above the Earth, at an angle of inclination of 98.6 degrees to the equator as it circles the globe from north pole to south pole.
		If the orbit is in the equatorial plane, and if rotation is in the same direction as the Earth, (rotating at the same angular velocity as the Earth) and it overflies the same point on the globe permanently then the satellite is termed geostationary.
	www.geo-orbit.org /sizepgs/geodef.html (6827 words)

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Topic: Earth Radii

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In the News (Thu 31 Dec 09)