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Site Search & Index Page 1 of 4 Site search & index Page 1 of 4 'The time has come,' the Walrus said, 'To talk of many things: Of shoes—and ships—and sealing wax— Of cabbages—and kings— Site Search - Index And why the sea is boiling hot— And whether pigs have wings.’ Alice Search the site: Home Google Search OpticsPOD www Atmospheric Optics What's New What's New Site Index: Rays & Shadows Water Droplets A B C D E F G HalosHIJKLMNOPR STV W Rainbows Aircraft - Sky phenomena from Angles in the sky - estimating them Ice Halos A Anti-crepuscular rays Anthelion ~ South Pole display High Atmosphere Antisolar halos Anti-crepuscular rays Links & Resources Flattened sun and moon Antisolar point Glory Centre of glory Search - Index Lower tangent arc Centre of heiligenschein Opposition effect Centre of opposition effect Subhorizon halos Convergence point of sunrays Subparhelia Arcs below horizon Subsun Arctic fogbows Lower sun pillars and subsun Artificial light pillars Ammonia crystal halos Atmospheric refraction 123456789012345678 Bishop's ring Books - sky phenomena Bending of light rays Brocken Spectre B Atmospheric refraction Mirages of sunsets Carbon dioxide crystal halos Coloured rings around ~ continued Circumscribed halos Shadows C Circumzenithal arc Brocken Spectre Cirrus cloud Glory Cloud bow = fogbow Heiligenschein Clouds Opposition Effect Colours - iridescence Colours at sunset Shadows Contact arcs to 22º halo Sizes of droplets in Contrail shadows Water content of Corona Coloured rings around Crepuscular rays Antisolar point opposite sun Crystals ~ Ice Sun and moon Alignment in clouds Corona Diamond dust 22º halo Plates & columns Sizes needed to make halos Dew - Heigenschein Distorted sunsets Diamond dust Dogs - sundogs D Crystals Double sunsets Sundog & sun pillar Dust - scattering by Diffraction By water droplets Corona formation Glory formation Earth's Shadow Eye safety E Etruscan vase sunset Looking at halos Looking at coronas False suns = sundogs Fogbows Fisheye lens From car headlights F Door viewer substitute Supernumerary arcs Mirror substitute Rainbows ~ relation to Fog - sizes of droplets in Flattened sun Flattened moon Green flash Glows around shadows Glory Glory G Formation Heiligenschein From the air ~ video Opposition effect On mountains Halos Halos (continued) 120º parhelia Multiple displays H 22º halo Observing halos Around the Moon Eye care! Colours Odd radius halos Formation & ray paths Other world halos http://www.atoptics.co.uk/resource/indx.htm 7/31/2008 Site search & index Page 2 of 4 How the circle is formed Parhelia Random orientations? Parhelic circle 46º halo Lunar Was it a supralateral arc? Many ray paths 9º halo Parry arcs Aligned crystals Discovery by Parry Ammonia crystal halos Effect of solar altitude Anthelic arcs Parry antisolar arc Anthelion ~ rare Parry infralateral arcs ~ rare Anthelion ~ South Pole display At South Pole Antisolar arc Parry supralateral arcs ~ rare Antisolar region arcs At South Pole Carbon dioxide crystal halos Sunvex & Suncave Circumhorizon arc Photography Circumscribed halo Pillars Circumzenithal arc Plate crystals Common halos Prisms Complex halo displays Pyramidal crystals Crystals Pyramidal crystal arcs Alignment in clouds Rare halos Cubic symmetry Why are some halos rare? Diamond dust St Petersburg display Plates & columns Safety! Pyramidal - Halos from Simulation of Real crystals and defects Subanthelic arcs Sizes needed to make halos Subhelic arc ~ rare Diffuse arcs South Pole ~ from the air Drawn by Parry in 1820 Eye care! Subhorizon arcs Frequency of occurence Subparhelic circle Visible more often than rainbows Subsun Frequent halos Subsun dogs HaloSim software Sundogs Hastings arc ~ rare Changes in appearance Heliac arc ~ rare Elongated Ice crystals Sometimes blindingly bright Infralateral arc Sun pillars Kern arc Supralateral arc Light pillars Tape arcs Lowitz arcs Tangent arcs Lunar halos Tricker arc ~ rare 22º circular Real ice crystals - photographs Circumscribed Halo Upside down rainbow Moon dogs Wegener arc ~ rare Paraselenae Paraselenic Circle Heiligenschein Hexagonal ice crystals Hole in the sky Ice crystals Iridescence Sizes to produce halos Iridescent clouds I Interference IRIS software Inversion - causing distorted sunsets Irisation J Jupiter - halos on? K Kern arc Lenticular clouds Links to other sites Light pillars Lowitz arcs L Light scattering Lunar fogbow By water droplets Lunar halos Rayleigh 22º circular Mie Moon dogs Mars Mist Abnormal brightness Sizes of droplets in M Halos on? Mist bow = fogbow Opposition effect Mock suns Mie scattering Moon Sunsets 22º halo Water droplets Colour during total eclipse Watery sunsets Crepuscular rays Minimum deviation phenomena Dogs = Paraselenae 22º halo animation Fogbow Fogbow Moonrise from Earth orbit Rainbow Moonset from ISS Sundogs Why is the full moon so bright? Mirages at sunset Mother of pearl clouds Mountain shadows Nacreous clouds http://www.atoptics.co.uk/resource/indx.htm 7/31/2008 Site search & index Page 3 of 4 N Opposition effect Orientation of ice crystals O Opposition effect on Mars Opposition effect streak Paranthelia = 120º parhelia Photo credits Paraselene Photographing halos P Parhelia Pileus cloud iridescence 22º Pillars 120º Pilot's Bow = glory or complete rainbow Parhelic circle Plate crystals Parry arcs Polar Stratospheric Clouds Parry arcs - discovery of Prisms Perspective effects - crepuscular rays PSCs Pyramidal ice crystals Rainbows Traffic sign bows AirySim Twinned bows R Airy theory Wave theory - need for Alexander's dark band Wheel Bowsim Zero order glow Cloud bows Colour purity Rainbow-like arcs Cone of rays 22º halo Dew Bows Circumzenithal arc Glass bead bows Corona Higher order bows Glory Key to section Upside down rainbow Moon bows Not rainbows! Rayleigh scattering - sunset colours Raindrop shapes Raindrop sizes Rays Raypaths for rainbows Crepuscular Primary Anticrepuscular Secondary Rays of Buddha higher orders Red bows Real ice crystals - photographs Reflection bows Refraction Seawater bows Atmospheric Secondary bow Water drop - fogbow, heiligenschein Spider web bow Rings around sun or moon Spokes 22º halo Supernumerary bows Circumscribed halo Colours Corona Drop size Odd radius halos On secondary bow Ropes of Maui = crepuscular rays Safety Shadows ~continued Looking at halos Glows around S Looking at coronas Glory Photography Heiligenschein Saturn - halos on? Opposition effect Scattering Sky colours Air Spectre of the Brocken Clouds Subanthelic point = antisolar point Light Halos around Mie Subparhelic circle Rayleigh Sun pillars Water droplets Sun beams = crepuscular rays Shadows Sun drawing water = crepuscular rays Brocken spectre Sundogs Clouds Changes in appearance Mist Elongated Rocket plumes Sometimes blindingly bright Contrails Sunsets Shadow hiding Supernumerary arcs - fogbow Surface waves T Tangent arcs Temperature inversion - at sunset V Venus pillar Volcanic eruptions - sunsets Water droplets in clouds and fog Watery sunsets W White rainbow = fogbow A B C D E F G Halos H I J K L M N O P R S T V W http://www.atoptics.co.uk/resource/indx.htm 7/31/2008 Site search & index Page 4 of 4 http://www.atoptics.co.uk/resource/indx.htm 7/31/2008.
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