Halo (optical phenomenon)

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Topic: Halo (optical phenomenon)

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	HALO - Online Information article about HALO
		Halos are at definite distances (22° and 46°) from the sun, and are coloured red on the inside, being due to refraction; coronae closely surround the sun at variable distances, and are coloured red on the outside, being due to diffraction.
		section of the prisms; the minimum deviation for such rays is 22°, and consequently the parhelia are not only on the inner halo, but also on the parhelic circle.
		outer halo 0, having radii of about 22° and 46°, and exhibiting the See also:
	encyclopedia.jrank.org /GUI_HAN/HALO.html (1910 words)

	Nikon MicroscopyU: Interactive Java Tutorials
		Optical Pathways in the Phase Contrast Microscope - The most important parameter in the design of a phase contrast microscope is to isolate the surround and diffracted light waves emerging from the specimen so that they occupy different locations in the diffraction plane at the rear aperture of the objective.
		Optical Sectioning in Reflected Light DIC - The ability to capitalize on large objective numerical aperture values in reflected light DIC microscopy enables the creation of optical sections from a focused image that are remarkably shallow.
		Without the disturbance of halos and distracting intensity fluctuations from bright regions in lateral planes removed the focal point, the technique yields sharp images that are neatly sliced from a complex three-dimensional phase specimen.
	www.microscopyu.com /tutorials/java (3927 words)

	BBC - Weather Centre - Features - Understanding Weather - Optical Phenomena
		Haloes may be accompanied by a whole array of circumzenithal arcs and parhelion (mock suns).
		Haloes around the sun are produced by light refracting as it passes through ice crystals in clouds.
		Haloes appear around the Sun or Moon when a layer of cloud composed of ice crystals lies between the Sun (or Moon) and the observer.
	www.bbc.co.uk /weather/features/understanding/optical_phenomena.shtml (693 words)

	Science Question of the Week - Halo around the moon - Jan. 24, 2003
		A halo is an optical phenomenon similar in concept to a rainbow but also very different.
		Often, a halo around the moon or sun is an indicator of cloudy or rainy weather as high level cirrus and cirrostratus clouds that cause halos tend to drift ahead of frontal systems (especially warm fronts) that produce rainfall.
		A halo is a ring of light that surrounds either the sun or moon and typically appears as bright white rings.
	www.gsfc.nasa.gov /scienceques2002/20030124.htm (353 words)

	Halo (glossary definition)
		Halo Group of optical phenomena, in the form of rings, arcs, pillars or bright spots around the Sun or Moon, produced by the refraction or reflection of light by ice crystals suspended in the atmosphere (Cirrus clouds, diamond dust, etc.)
	nsidc.org /arcticmet/glossary/halo.html (40 words)

	GUIDO HORN D’ARTURO The phenomenon of the “black drop” and astigmatism
		Such halo cannot be as bright as the Sun and is considerably less dark than the Planet, to the extent that many mistook it for its atmosphere, lit by sunlight from behind.
		The crescent shape that reveals the real nature of the phenomenon is largely confirmed by a significant amount of information in the astronomical annals, where the appearance is generally ascribed to the atmosphere of the Planet.
		Yet, a closer look at this phenomenon shows that deformation caused by astigmatism is also subordinate to the relationship between the luminous intensity of the image and that of the background on which it is cast.
	www.bo.astro.it /~biblio/Horn/Blackdrop.htm (6374 words)

	esm_lutgens_atmosphere_9Optical Phenomena of the AtmosphereSummary
		Halos are produced by dispersion of sunlight from atmospheric ice crystals that refract light.
		A mirage is an optical effect of the atmosphere caused by refraction when light passes from air with one density into air with a different density and the object appears displaced from its true position.
		The bending of light by refraction is responsible for such common optical illusions as the apparent displacement of the position of the stars, Moon, and Sun.
	wps.prenhall.com /esm_lutgens_atmosphere_9/0,7475,632531-,00.html (820 words)

	HALOS
		Halos are optical phenomena that appear in the sky near or around the Sun or Moon, for example "sun-dogs" or the parahelia, or a paraselene or "mock-moon." There are many other types of halos, but they are all caused by ice crystals high in the atmosphere.
		Optical phenomena such as halos were used as an empirical means of weather forecasting before meteorology was developed.
		The particular shape and orientation of the crystals is responsible for the type of halo observed.
	www.websters-online-dictionary.org /ha/halos.html (718 words)

	Rainbow, halo and glory
		One reason is that the most common halos happen in the direction of the sun, a region of the sky we instinctively try to avoid; and the bright background of clouds and sky provides less contrast than the dark frame of the rainbow.
		Besides, in the case of the more rare halos their origin may be controversial and a polarization measurement can pinpoint the correct explanation (for some halos there is still NO explanation).
		The most common halos are the Sun Dogs (also called mock suns or false suns): bright multi-colored patches of light on both sides of the sun (to find them extend from the sun one hand at arm length).
	www.polarization.com /rainbow/rainbow2.html (1387 words)

	halo
		Halo (optical phenomenon) Picture from the NOAA Photo Library Halos are optical phenomena that appear in the sky near or around the Sun or Moon, for example "sun-dogs" or the parahelia, or a paraselene or "mock-moon." There are many other types of halos, but they are all caused by ice crystals
		HALO Trust The HALO Trust is a registered British charity and registered American NPO whose purpose is to remove the debris left behind by war, in particular, landmines and unexploded ordinance that might present a danger to local civilians.
		HALO is an acronym of Hazardous Areas Life-Support Organisation.
	www.searchtermtrends.com /terms/halo.html (1018 words)

	In the Clouds Photography - weather gallery (optical phenomenon)
		The most well-recognized atmospheric optical phenomenon is a rainbow but water drops and ice crystals produce a variety of optical effects; many of which occur regularly but go unnoticed because of our natural tendency not to look into the glare of the sun.
		Weather Gallery (Page 3 of 6): Optical Phenomenon
		The main contributor to whether a halo appears vs. perhelia is the orientation of the ice crystals.
	www.inclouds.com /Wx/optical.html (847 words)

	Livid's Lividict - halo
		The halo is a purely optical illusion, produced by moisture in the air, in the manner of a rainbow; but the aureola is conferred as a sign of superior sanctity, in the same way as a bishop's mitre, or the Pope's tiara.
		{Haloing}.] To form, or surround with, a halo; to encircle with, or as with, a halo.
		The fire That haloed round his saintly brow.
	lividict.org /lividict/halo.html (1209 words)

	Press Info on the Gamma-Ray Halo
		A huge cloud of high-energy gamma-rays forms a halo extending into outer space from the Milky Way, a phenomenon that cannot be accounted for by known celestial bodies, scientists from the University of California, Riverside, Clemson University and University of Chicago reported today (Tuesday, Nov. 4).
		The high-energy gamma rays seen in the halo could be the result of collisions of high-energy cosmic rays, in the form of electrons, traveling at near the speed of light and colliding with low energy photons they encounter is space, Dixon said.
		These pulsars, however, would have to exist in great numbers to account for the gamma-ray halo seen by Dixon and his colleagues.
	tigre.ucr.edu /halo/halo.html (1424 words)

	ITP - Optical Monitoring
		Theoretical evaluations of the optical depth for the presently known gravitational mirages show that the probability of microlensing is high.
		The main interest of the phenomenon is that the size of the Einstein ring for such microlenses is of the order of De = 1 micro-arcsec.
		In particular, it is possible to determine whether the dark matter component in the halo of the lensing galaxy consists of massive compact halo objects ("MACHOs").
	www.iac.es /proyect/gravs_lens/GLITP/om.html (1236 words)

	Pictures of Antarctic weather phenomena
		Halos are a group of optical phenomenon due to the reflection or refraction of solar light on ice crystals suspended in the atmosphere (cirrus clouds, thin snow, icy fog, blown snow).
		Halo circles are often visible in winter when there are some thin high clouds.
		The Loewe phenomenon is a katabatic flow jump, or in simpler words a kilometer high wall of snow and wind fury that can form when the katabatic wind jumps over a sharp drop.
	www.gdargaud.net /Antarctica/AntarSky.html (2110 words)

	MSI - Glossary_P
		Optical phenomenon of the halo family, similar to but less brilliant than the parhelion, the luminary being the Moon.
		Photometeor of the halo family, consisting of two luminous iridescent spots appearing on the parhelic circle, to the right and left of the Sun and at the same height, close to the large halo.
		Photometeor of the halo family, consisting of two luminous iridescent spots appearing on the parhelic circle, to the right and left of the Sun and at the same height, close to the small halo.
	www.msc-smc.ec.gc.ca /education/imres/glossary/glossary_p_e.html (4515 words)

	October Ice Halo
		This phenomenon is fairly common and is caused by the prism effects of millions of ice crystals that compose the cirrus clouds.
		The heavy arrow shows the optical path of a light ray through the prism-like crystal.
		It behaves optically very similarly to a common triangle crystal or prism.
	www.warren-wilson.edu /~physics/PhysPhotOfWeek/20050325OctoberSunHalo (615 words)

	pr-04-99.html
		The stars that are lost move on in orbits similar to that of the cluster and populate the halo of the Milky Way.
		It may be explained by a gradual loss of such stars from the cluster into the Milky Way halo, a roughly spherical region around the much flatter, spiral structure in which most of the stars and nebulae are located.
		The brightest objects in the halo are the
	www.eso.org /outreach/press-rel/pr-1999/pr-04-99.html (1990 words)

	Sun Dog Days
		Today we known this is often a valid prediction, because haloes and sun dogs are produced by ice crystals that form the cirroform clouds which make up the typical cloud sequence preceding a precipitating warm front.
		Halo formation requires a mixture of random ice crystal orientations in the sky.
		Crystals forming most optical phenomena in the air are typically hexagonal rods, shaped like pencils, or flat, hexagonal plate patterns, like microscopic stop signs or dinner plates.
	www.suite101.com /article.cfm/science_sky/77278 (748 words)

	Cirrostratus
		The ice crystals forming this cloud gives an optical phenomenon which shows as a halo around the sun or moon.
		The halo is normally white but can, as here, be very clear and display all the colours of the rainbow.
		Since this cloud is formed at high altitudes, the halo effect can even be seen from a cockpit at 10000 metres.
	www.chitambo.com /clouds/cloudshtml/cirrostratus.html (112 words)

	esm_lutgens_atmosphere_9Optical Phenomena of the AtmosphereMultiple Choice
		The only optical phenomenon more commonly witnessed in association with the Moon than with the Sun is the __________.
		The primary optical phenomena responsible for producing a rainbow are __________.
		A narrow whitish ring centered on the Sun, called a halo, is most frequently observed in __________ regions.
	wps.prenhall.com /esm_lutgens_atmosphere_9/0,7475,632541-,00.utf8.html (194 words)

	The Heiligenschein
		In German, we must distinguish between its use for the optical phenomenon under discussion, for the phenomenon called the glory in English, and for the halos that are the effect of refraction and reflection in ice crystals.
		A related phenomenon, the glory (q.v.) is also seen around the shadow of your head, but a shadow in a cloud or fog, where the drops are much smaller, say 20 μm in diameter, than in the dewy grass, where the drops are millimeter sized.
		Your head is surrounded by a lustrous halo of slightly green light to an angular distance of a degree or so from the centre of the shadow of your head.
	www.du.edu /~jcalvert/astro/heilig.htm (2120 words)

	Minnaert and beyond
		These phenomena could be a manifestation of some sort of weak 'moonvolcanism' or outgassing, or the mysterious phenomenon, known as Lunar dust migration or Lunar dust levitation : a kind of electrostatic 'duststorm', travelling along with the lunar terminator (sunrise/ sunset on the moon).
		The Glory, the cloudbow, and sub-horizon halo effects.
		because these effects are nothing else than light coming from a certain direction, in respect to the (optically infinite) pointlike lightsource that produces them.
	www.geocities.com /CapeCanaveral/Launchpad/5320/minnaert.html (1398 words)

	ANNUAL REPORT
		The vapor plume emits optical radiation that is characteristic of the alloy being probed.
		Coherent excitation of one normal mode using a pair of phase-controlled optical pulses gives rise to a nonlinear response on the other normal mode due to the nonlinearity of the exciton transition underlying the normal modes.
		Visible ultrashort pulses were generated by recompression of the output of a home-built broad band optical parametric amplifier constructed according to the design of Wilhelm et al.
	www.eecs.umich.edu /CUOS/research/AnnualReport/1999 (14433 words)

	Halo 2 vs. Half Life 2 & Doom3
		Halo was made famous in part with its nice outdoor enviroments and all we've seen in halo 2 are walls and cities.
		Halo 2 and even HL2 use a mixture of global illumination (which I thought was the basic form of lighting used in most games) and dynamic lighting which is the type used in Splintercell (but not exclusively).
		Halo 2 might be popular and its longetivity may be extended after the initial 20 times of beating the game in coop on Legendary (or similar) via Xbox Live downloadable content.
	journal.pcvsconsole.com /?thread=6055 (16075 words)

	Halo 2 preview: General Articles / First Looks @ Bytesector.com
		The Halo franchise has definitely proven itself to be a lasting cultural phenomenon.
		Coupled with the fact that Halo was released in November 2001 to accompany the launch of the Xbox nearly three years ago, one can see that the Halo franchise still garners tremendous mass market appeal.
		For those of you living under a rock, the game is Halo 2.
	www.bytesector.com /data/printpage.asp?id=329 (399 words)

	Rainbow Info
		It looks like another beautiful optical phenomenon, a halo phenomenon call circum- horizonthal arc..
		The phenomenon in the picture is a halo called circumhorizonthal arc, as I earlier said.
		Either the phenomenon is not be lower tangent arc due to colors.
	www.cs.princeton.edu /~rywang/berkeley/info/rainbows_info.html (1093 words)

	halo - OneLook Dictionary Search
		Words similar to halo: aura, nimbus, annulus, anulus, aureole, doughnut, glory, haloes, haloing, ring, anchor ring, more...
		Phrases that include halo: halo effect, halo blight, solar halo, halo spot, galactic halo, more...
		HALO, halo : Stammtisch Beau Fleuve Acronyms [home, info]
	www.onelook.com /?w=halo&ls=a (373 words)

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Topic: Halo (optical phenomenon)

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