independent

Thursday 17 April 2014

Stunning sunrise brings warm glow to cold morning

This stunning shot of the River Liffey in Dublin was taken by @andresito.

A beautiful red sunset added a heartwarming warm glow over the country this morning.

Some beautiful photos appeared on Twitter today, and here we've included some of them.

Professor Peter Lynch from UCD's Meteorology and Climate Centre said red skies are caused by the scattering of red light from the sun against particles in the sky.

"It has to do with the absorption and refraction of light. The light is coming from the sun, [and the colour of the sky] depends on the path that the light takes."

"The blue light is scattered most effectively and that's why we normally see the sky as blue."

Red light is 'scattered' when dust or clouds or water droplets are in the sky, the Professor said.

"In the early morning or the late afternoon, the light has to travel a greater distance, it has to travel through the atmosphere so there's a bigger chance for red light to get scattered."

"It's particularly pronounced when there's dust in the air or if there's been a volcanic eruption or if there is industrial pollution, but that occurs as an angrier red."

Carlow scientist John Tyndall coined the term the Tydnall Effect in the 19th century for the scattering of light by particulate impurities in air and other gases, and in liquids.

The Rayleigh effect is in combination with the Tyndall effect, as microscopic dust particles at lower levels scatter shorter wavelength (blue) light away and allow longer (red) wavelengths to reach the observer. Thus, the degree of red in a sunset varies depending on the weather.

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