halos galore! - a photo on Flickriver

halos galore!

            and a bare maple tree.
A Parry arc changes its shape subject to the elevation of the sun. It is mainly observed at sun elevations between 15° and 40°. Then it can be seen as a concave arc between the two “branches” of the upper tangent arc or above the circumscribed halo. At very low sun elevations the arc is formed convex towards the sun. The Parry arc is a rather faint, but colourful arc. Towards the sun it is of an orange-red colour while its outer part is faintly bluish. At very low or very high sun elevations a Parry arc becomes so faint that it can hardly be seen. In rare cases, at very high sun elevations, also a lower Parry arc can occur. At a sun elevation of about 50° it is below the 22 -halo and touches the 22°-halo at a sun elevation of 71°. Always when there is a unusually bright tangent arc or circumscribed halo, there is also a good chance for the appearing of Parry arc.

Occurs 2-6 times a year.
   

Taken on: November 30, 2011

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Camera: Nikon D3100, f/9.0, 1/320 sec, 24mm (=36mm), ISO 100 (more info) (hide info)

Camera:	Nikon D3100
Aperture:	f/9.0
Exposure Time:	0.003 sec (1/320)
Focal Length:	24mm (35mm equivalent: 36mm)
ISO:	100
Exposure Bias:	0 EV
Flash:	Auto, Did not fire
Exposure Program:	Not Defined
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	sRGB
Software:	picnik.com
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