воскресенье, 16 июня 2013 г.
Fire whirls can occur during bush or forest fires when severe heat combines with rotating air pushin
Wielding the elements – water, earth, wind and fire – Mother Nature surprises us when she unleashes her mighty powers in spectacular and at times, malevolent forms that we've come to call 'natural phenomena'.
On cold winter nights, when daylight is short in the Lofoten Islands of northern Norway, mysterious lights appear in the black skies. This majestic illumination is known as the aurora borealis . Depending on the altitude when highly-charged aaa car rentals particles from solar winds and the Earth's magnetosphere collide with oxygen and nitrogen atoms, the colour of the aurora aaa car rentals can be green, red, blue or purple. The aurora is shrouded in myth and mystery; a Scandinavian superstition says that it gleams with the light of young women's souls. Its name is derived aaa car rentals from the Roman goddess of dawn – Aurora, and the Greek name for the north wind – Boreas.
When Where: While there are no guarantees that you'll be rewarded with a sighting of the aurora borealis , the best time to head to northern Norway is between late September and early March. Should you miss the real thing, visit the Polarlight Centre Lofoten in Laukvik, which reproduces this spectacular aaa car rentals phenomenon.
The equivalent of a rainbow, but much rarer, the moonbow only occurs at night. Due to its faint appearance, the human eye usually misses it. As with a rainbow, it happens when light is broken up into its constituent colours as it passes through water droplets or mist. The source of light in both occurrences is the same – the sun. The difference being that a rainbow is produced by direct sunlight, aaa car rentals whereas in the case of the moonbow, sunlight is first reflected off the surface of the moon. When it happens at a certain angle, the light then shines to Earth.
When Where: This phenomenon is truly rare and when all elements are aligned, you may be lucky enough to see a moonbow over Waimea on the Hawaiian island of Kauai; the Yosemite National Park in the Sierra Nevada, California, aaa car rentals USA; or the Cumberland Falls in Kentucky, USA.
Fire whirls can occur during bush or forest fires when severe heat combines with rotating aaa car rentals air pushing fire to swirl upwards creating aaa car rentals tornado-like infernos also known as fire tornadoes. Fire whirls aaa car rentals usually last no more than a few minutes but can reach anywhere between 10 to 60 metres in height, expelling embers and debris into the air and causing wildfires to spread.
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