Blue spot on the parhelic circle

Mika Sillanpää; Jarmo Moilanen; Marko Riikonen; Marko Pekkola

doi:10.1364/AO.40.005275

Blue spot on the parhelic circle

Mika Sillanpää, Jarmo Moilanen, Marko Riikonen, Marko Pekkola

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We develop a theory for a new effect on the parhelic circle. We show that there is a colored segment on the parhelic circle at a certain large azimuth that depends on solar elevation. The color segment appears at solar elevations below 32° and is explained as a transition between total and partial internal reflection in the main ray paths of the parhelic circle in oriented ice crystals. Based on our simple refraction theory and computer simulations, we find that the color of the segment is mainly green and blue. The theory is tested with available photographs of the effect.

Original language	English
Pages (from-to)	5275-5279
Number of pages	5
Journal	Applied Optics
Volume	40
Issue number	30
DOIs	https://doi.org/10.1364/AO.40.005275
Publication status	Published - 10 Oct 2001
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Engineering (miscellaneous)
Electrical and Electronic Engineering

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10.1364/AO.40.005275

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AU - Sillanpää, Mika

AU - Moilanen, Jarmo

AU - Riikonen, Marko

AU - Pekkola, Marko

PY - 2001/10/10

Y1 - 2001/10/10

N2 - We develop a theory for a new effect on the parhelic circle. We show that there is a colored segment on the parhelic circle at a certain large azimuth that depends on solar elevation. The color segment appears at solar elevations below 32° and is explained as a transition between total and partial internal reflection in the main ray paths of the parhelic circle in oriented ice crystals. Based on our simple refraction theory and computer simulations, we find that the color of the segment is mainly green and blue. The theory is tested with available photographs of the effect.

AB - We develop a theory for a new effect on the parhelic circle. We show that there is a colored segment on the parhelic circle at a certain large azimuth that depends on solar elevation. The color segment appears at solar elevations below 32° and is explained as a transition between total and partial internal reflection in the main ray paths of the parhelic circle in oriented ice crystals. Based on our simple refraction theory and computer simulations, we find that the color of the segment is mainly green and blue. The theory is tested with available photographs of the effect.

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U2 - 10.1364/AO.40.005275

DO - 10.1364/AO.40.005275

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JO - Applied Optics

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ER -

Blue spot on the parhelic circle

Abstract

ASJC Scopus subject areas

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