Report ‘Eclipse Wind’ Mystery Resolved By Researchers After Studying 2015 UK Solar Eclipse

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The mysterious “eclipse winds” — the sudden change in wind direction and speed that occurs when the moon blocks out the sun — have long baffled scientists. Now, in two separate studies published in the Philosophical Transactions of the Royal Society A, researchers have put forward an explanation for this mysterious phenomenon.

In order to study the effects of a solar eclipse on winds, researchers from the University of Reading sought the help of 4,500 citizen scientists around the U.K., who took part in the National Eclipse Weather Experiment during the partial eclipse in March last year. After analyzing the data collected, they found that not only did wind speeds drop by up to 4 knots (4.6 miles per hour) in parts of the U.K., temperatures also dropped by roughly 1 degree Celsius (1.8 degrees Fahrenheit) in parts of the country.

The researchers concluded that the wind change was caused by variations in the "boundary layer" — the area of air that separates high-level winds from those at the ground.

“There have been lots of theories about the eclipse wind over the years, but we think this is the most compelling explanation yet,” co-author Giles Harrison from the University of Reading said in a statement. “As the sun disappears behind the moon the ground suddenly cools, just like at sunset. This means warm air stops rising from the ground, causing a drop in wind speed and a shift in its direction, as the slowing of the air by the Earth’s surface changes.”

Read more here. (International Business Times)
 
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