The Parhelia (The Sun dogs)


Date & Time: Jan 19 2002 16:13 JST(+0900), 1/2000sec. Exp.
Optical: f=6.2mm F8.0 (equivalent f=40mm in 35mm film format)
Digital Camera: CASIO QV-2800UX
Location: Ooizumi vil., Yamanashi pref.

Camera Settings: Mode...1600 x 1200 FINE
CCD sensitivity...ISO80, White Balance...Daylight



Close-up of Parhelia

Date & Time: Jan 19 2002 16:13 JST(+0900), 1/1500sec. Exp.
Optical: f=14.8mm F8.0 (equivalent f=100mm in 35mm film format)
Digital Camera: CASIO QV-2800UX
Location: Ooizumi vil., Yamanashi pref.

Camera Settings: Mode...1600 x 1200 FINE
CCD sensitivity...ISO80, White Balance...Daylight




Schematic image of Parhelia
Principle of Parhelia by ice crystals
When ice crystals are distributed on some condition in the sky, you can observe the lumps of light like the two suns in both sides of real sun. This photograph shows you one fake appeared on the left of real sun sinking in the western sky, the magical phenomenon is called "Parhelia" or "Sun dogs".
It's the hexagonal horizontal-plate ice crystals distributed in the sky that shows us the Parhelia. In case that ice crystals are distributing at random, the refracted light of 22 degrees by the solar light forms the "22 degrees halo". But when crystal distributed being their bottom plate paralleling to the ground is predominant, only refracted solar light on the right and left of the sun 22 degrees apart reaches observer. These refracted lights are detected as the Parhelia. It sometimes seems that some colors are separated like a rainbow.

Other images of Parhelia





The Circumscribed Halo

The Fullmoon & Corona


Copyright(c) 2002 by Naoyuki Kurita, All rights reserved.
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