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SNOW

IN PICS: Mysterious glow lights up Spain’s highest mountain

A photographer has captured stunning images of Tenerife’s Tiede volcano dusted with snow and lit by a celestial light.

IN PICS: Mysterious glow lights up Spain’s highest mountain
Juan Carlos Casado / Instituto de Astrofísica de Canarias

The phenomenon known as zodiacal light appears as a pyramid-shaped glow that is best viewed around an hour after sunset and is visible to lucky stargazers in Tenerife for the next few weeks.

Zodiacal light is caused by sunlight reflecting off interplanetary dust particles that orbit the sun within the inner solar system at a distance of about 600 million km from earth.

IN PICS: Snow and ice transforms Spain into winter wonderland

These grains are ancient, and are thought to be left over from the process that created Earth around 4.5 billion years ago.

The glow coincides with snowfall on El Tielde volcano, which at 3,718 meters (12,198ft) above sea level is  Spain’s highest mountain.

These two images were captured on February 3rd by Juan Carlos Casado and Daniel López and published by the Astrophysics Institute of the Canary Islancds

The photos were taken from the Teide Observatory, the largest solar observatory in the world, which is located in the El Teide National Park, a UNESCO World Heritage Site and a recognised ‘Starlight Tourist Destination’ because of its exceptionally clear and protected dark skies.

READ ALSO: Spain reaches for the stars with astronomy travel agency

John E Beckman an astrophysicist at the Instituto de Astrofísica de Canarias explained exactly what it was that the photos capture.

“The zodiacal light is sunlight reflected off very fine dust particles which lie in the plane of the ecliptic. This is the plane in which the planets orbit the sun, and is a remarkably very thin disc, all the planets orbit in the same plane,” he told The Local.

“In very clear air, away from contamination and light pollution it is possible to see it with the naked eye, and of course a photograph accumulates light and makes it much easier to pick out.”

And the best way to see it?

“It is hard to see in moonlight, so observable only when the moon is either dark or well below the horizon.

“It is strongest near to the sun, so best observed just after sunset or just before sunrise, although with any kind of cloud or dust in the air this will not be possible as the remaining sunlight scattered in our atmosphere will conceal it.

“As the dust particles are very small they tend to spiral in to the sun quite quickly, and need to be continually replaced. This must be due to cometary material which is stripped from the comets as they go close to the sun.”

He explained that the Teide is an amost perfect observational site:

“The Teide National Park is an almost ideal site to observe the Zodiacal Light, as it has very clean air, and in many directions the light pollution from towns is very small, which is one of the reasons why we have the observatories.”

WEATHER

VIDEO: Meet the rooftop snow clearers keeping Stockholm safe

Stockholm's snow-topped buildings may look charming, but heavy snowfall can be dangerous. An army of 'sweepers' take to the city's rooftops to clear them of snow in a carefully managed operation.

VIDEO: Meet the rooftop snow clearers keeping Stockholm safe
Rooftop snow cleaner Andrei Pilan clears buildings in Stockholm's picturesque old town. Photo: Jonathan Nackstrand/AFP

Teetering on the edge of a black tin roof ten metres (33 feet) above ground, Andrei Plian and Alex Lupu clear a thick white blanket of snow off a building in Stockholm’s historic Gamla Stan (Old Town), while their colleague on the street below keeps watch to warn pedestrians passing by.

While to many the job would be vertigo-inducing, for Plian and Lupu – two roofers by trade – it gives them a chance to admire the view.

“Being here on the roof and looking up at the sky, you feel that freedom,” Plian tells AFP, seemingly ignoring the biting subzero chill.

Secured with ropes, carabiners and a safety harness, he climbs the few remaining steps on a ladder attached to the roof and breaks the serene quiet of the sunny February morning with a clank as his shovel hits the tin roof.

Click on video below to watch:

The constant clearing of snow from the city’s roofs is first and foremost done for “the safety of the people”, but also to maintain the buildings, many of which are hundreds of years old.

“If there is too much snow on the roof it is too heavy for it so you have to take it off,” the 36-year-old says

A ten-year roofing veteran, he moves around fluidly and with confidence. Getting the job done quickly is key as more roofs are waiting, but safety remains a top priority.

“Every time you have to think about safety, it’s the number one rule. You don’t have room for a mistake here. If you make one mistake it could be your last,” Plian says.

In early February, another snow clearer was seriously injured while clearing a roof in the northern Swedish town of Umeå, with initial findings showing he wasn’t wearing his safety harness.

Under Swedish law, property owners are responsible for clearing snow and ice off their buildings if it threatens to fall and injure someone, but accidents are rare.

“As far as I can remember there has only been two deaths in the last 20-30 years or so,” Staffan Moberg, spokesman for the insurer industry group Svensk Försäkring, told AFP.

In one case in 2002, a 14-year-old died after being struck by a large block of ice that broke off a building on Stockholm’s main shopping street Drottninggatan.

Moberg added that they don’t keep statistics on incidents since they are rarely requested, and while accidents do happen on occasion, “the consequences are mostly not lethal and very seldom even severe”.

But after every fresh snowfall, signs immediately sprout up on sidewalks and facades warning passers-by of the risk of falling snow and ice, awaiting the arrival of the “snowploughs” in the sky.

While Plian and Lupu are busy at work on the roof above, Fredrik Ericsson is tasked with ensuring the safety of pedestrians down below.

Using a high-pitched whistle, he signals their comings and goings: when he blows his whistle once the shovelling stops to let people pass, and two whistles signals the all-clear to resume work.

Ericsson concedes that it can be a tricky task as people are often oblivious, sometimes wilfully, to the work going on.

“They don’t show that much respect, they just walk past, so I have to stop and yell at them,” he explains. “They don’t see the danger.”

By AFP’s Helene Dauschy

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