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Sun Pillar
Sun Pillar
Description: The 13,625-acre Laurel Ridge State Park stretches along Laurel Mountain from the picturesque Youghiogheny River At Ohiopyle, PA to the Conemaugh Gorge near Johnstown, PA. This large park spans Cambria, Fayette, Somerset and Westmoreland counties. The main feature of the park is the 70-mile Laurel Highlands Hiking Trail, which features trail shelters for overnight camping

Date Taken: 10/18/2008
Views: 856
City: Johnstown
*ApertureValue: 4
*ISOSpeedRatings: 400
State: pennsylvania
Zipcode:
Country: United States
*Camera: Canon EOS DIGITAL REBEL XT
*ShutterSpeedValue: 8.96578979492188
*From Exif Data (See All)
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Classic Comments
Most sun pillars are formed by plate-like crystals. Pillar forming plates range from the ideal crystals at left to large and wobbly semi-snowflake varieties. Optical perfection is unnecessary. Often pillars are the only halo in the sky because crystal faults like side faces blocked by growths or internal defects prevent other arcs from forming. Upper pillars are created by rays reflected downwards from the lower faces of tilted crystals. In plate crystals of good quality, a significant number of pillar forming rays enter a side face, undergo total internal reflection an odd number of times from the upper and lower basal faces and then leave through the opposite side face. The refraction at the two faces is equal and so the pillar is not coloured. However, pillars adopt the colours of the incident sunlight which may be highly reddened. Lower pillars form when light is reflected upwards from the topmost crystal face. Most halos are at their finest when crystals are well aligned. In contrast, sun pillars need crystals with large tilts. The larger the tilts the taller is the pillar. http://www.atoptics.co.uk/halo/platpill.htm -- johnstownwildfire
 
Uploaded on 10/19/2008
by johnstownwildfire
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