Residents of Argentina were astonished by a natural phenomena knows as “Parhelion”
By Staff Writer
(INTELLIHUB) — Yesterday, just after 7pm, residents of Santiago del Estero, Argentina witnessed “three suns” in the sky.
This was caused by a phenomena known as a parhelion (Sun Dog) and is produced by the effect of the sun’s rays passing through ice crystal fragments in the atmosphere. Sometimes a bright reddish spot can be seen on both sides of the Sun .
In order for a full halo to be formed it is necessary for the ice crystals in the atmosphere to be spread out in all possible directions. However, that does not always occur. When the atmosphere is extremely quiet, the crystals tend to fall horizontally.
When the Sun is at a low altitude, these crystals happen to be in the right position to refract the Sun’s light toward its sides, producing two sources of light next to it. This is what happened this week in Argentina, much to the surprise of local residents.
Pictures and descriptions were posted and uploaded all day to social media, capturing the rare event.
A set of powerful parhelia in Rome in the Summer of 1629 caused René Descartes to interrupt his metaphysical studies and led to his work of natural philosophy called “The World”
Sundogs are red-colored at the side nearest the sun. Farther out the colors grade through oranges to blue. However, the colors overlap considerably and so are muted, never pure or saturated. The colors of the sundog finally merge into the white of the parhelic circle (if the latter is visible).
It is possible to predict the forms of sundogs as would be seen on other planets and moons. Mars might have sundogs formed by both water-ice and CO2-ice. On the giant gas planets — Jupiter, Saturn, Uranus and Neptune — other crystals form the clouds of ammonia, methane, and other substances that can produce halos with four or more sundogs