![]() “It’s important to consider this aspect of safety,” said Houard. But the scientists believe the technology could still be useful, as launchpads and airports often have designated areas where no-fly restrictions apply. The laser is powerful enough to be a risk to the eyes of overflying pilots, and during the experiments air traffic was closed over the test site. The shoes nubuck upper appears primarily in Tour Yellow, with dark grey contrasting the wings on the side wall. About this product Bringing back the 2006 colorway, the Air Jordan 4 Retro PS Lightning 2021 released a decade and a half later, appearing here in preschool sizes. These channels, which last for milliseconds, are more electrically conductive than the surrounding air, and so form an easier path for the lightning to follow. Applicable costs included with no additional charges upon delivery. This leads to a long chain of what the researchers call filaments in the sky, where air molecules rapidly heat up and race away at supersonic speeds, leaving a channel of low density, ionised air. When laser pulses are fired into the sky, a change in the refractive index of the air makes them shrink and become so intense that they ionise air molecules around them. The laser diverts lightning bolts by creating an easier path for the electrical discharge to flow along. The footage shows that the lightning bolt followed the laser path for about 50 metres, suggesting that the pulses helped steer the strike. Only one strike, on 21 July, happened in clear enough conditions for the researchers to film the path of the lightning from two directions using high speed cameras several kilometres away. Instruments set up to record lightning strikes showed that the laser diverted the course of four upward lightning discharges over the course of the experiments. The scientists waited for storms to gather and between July and September last year, fired rapid laser pulses at thunderclouds for a total of more than six hours. Writing in the journal Nature Photonics, Houard and colleagues in Switzerland describe how they carted a powerful laser to the top of the Säntis mountain in north-eastern Switzerland and parked it near a 124m-high telecoms tower that is struck by lightning about 100 times a year. But in more recent times, scientists have looked for other ways to protect buildings and objects from damaging strikes. Traditional lightning rods date back to Benjamin Franklin who used to chase thunderstorms on horseback before his famous kite experiment in 1752. More than a billion bolts strike Earth each year, causing thousands of deaths, 10 times as many injuries, and damage that runs into tens of billions of dollars. The charge carried in a bolt is so intense that it reaches 30,000C, about five times hotter than the surface of the sun. Lightning bolts are huge electrical discharges that typically spark over two to three miles. “The hope is to extend that protection to a few hundred metres if we have enough energy in the laser.” ![]() You may have to select a menu option or click a button.“Metal rods are used almost everywhere to protect from lightning, but the area they can protect is limited to a few metres or tens of metres,” said Aurélien Houard, a physicist at École Polytechnique in Palaiseau. Follow the instructions for disabling the ad blocker on the site you’re viewing.You may have more than one ad-blocker installed. You’ll usually find this icon in the upper right-hand corner of your screen. Click the icon of the ad-blocker extension installed on your browser.When it turns gray, click the refresh icon that has appeared next to it or click the button below to continue.Click on the large blue power icon at the top.Click the UBlock Origin icon in the browser extension area in the upper right-hand corner.It will turn gray and the text above will go from “ON” to “ OFF”. Click on the “ Ad-Blocking” button at the bottom.Click the Ghostery icon in the browser extension area in the upper right-hand corner.Switch off the toggle to turn it from “ Enabled on this site” to “ Disabled on this site”.Click the AdBlocker Ultimate icon in the browser extension area in the upper right-hand corner.“ Block ads on – This website” switch off the toggle to turn it from blue to gray.Click the AdBlock Plus icon in the browser extension area in the upper right-hand corner.Refresh the page or click the button below to continue. ![]() ![]() Under “ Pause on this site” click “ Always”.Click the AdBlock icon in the browser extension area in the upper right-hand corner.Adblock Adblock Plus Adblocker Ultimate Ghostery uBlock Origin Others ![]()
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