By this mechanism, lightning will strike in the same area repeatedly. However, once the charge in the cloud becomes high enough again, the flow through the channel is restored, leading to a second discharge of lightning. The reduction of charges in the channel causes the break. These appear to discharge negative charges from the main channel, which subsequently re-enter the cloud. The results, they say, clearly show the occurrence of a break in the discharge channel, at a location where needles formed.
The antenna array and the very precise time stamp on all the data allowed them to pinpoint the emission sources with unprecedented resolution. They developed a new algorithm for the data, allowing them to visualise the VHF radio emissions from two lightning flashes. In the recent study, the researchers used only LOFAR stations in The Netherlands, covering an area of 3200 square kilometres, and analysed the raw time-traces – which are accurate to one nanosecond – measured in the 30-to-80 megaherz (MHz) band. It is used primarily for radio astronomy observations, but the frequency range of the antennas also makes it suitable for lightning research, because discharges produce bursts in the very high frequency (VHF) radio band. LOFAR comprises thousands of simple antennas that are spread over Northern Europe but connected with a central computer through fibre-optic cables, allowing them to operate as a single entity. “These needles can have a length of 100 metres and a diameter of less than five metres, and are too small and too short-lived for other lightning detections systems,” says Brian Hare, also from the University of Groningen. “This finding is in sharp contrast to the present picture, in which the charge flows along plasma channels directly from one part of the cloud to another, or to the ground”, says Olaf Scholten, from the University of Groningen in The Netherlands.Īnd it hasn’t been noticed before because there wasn’t equipment powerful enough to do so. Some are stored inside structures the researchers have called needles, making a repeated discharge to the ground quite possible. In November, 2021, Maryland Lottery announced a lucky Chevy Chase woman had won $50,000 three times with tickets purchased at Talbert’s.Lightning strikes twice in the same place surprisingly often and now, thanks to a Dutch radio telescope network called the Low Frequency Array ( LOFAR), scientists have a better idea why.Īn international team used the array to study the development of lightning flashes in unprecedented detail, and discovered that the negative charges inside a thundercloud are not discharged in a single flash. This is or course not the first time Talbert’s sold a winning lottery ticket. He also plans to use the winnings to put a down payment on a house. He sold his house at one point to keep his restaurant going, so he plans to use some of these winnings to help his restaurant. This prize will help him professionaly and personally. The man told Maryland Lottery officials he has met with success in past drawings, he won $150,000 previously with a ticket he purchased in Washington, D.C. He plays the multistate jackpot games Powerball and Mega Millions and buys lottery tickets in Virginia, the District and Maryland. The winner, an unamed 66-year-old chef who lives in Vienna, works in the District. The $150,000 winning Powerball ticket was sold at the Talbert’s Ice & Beverage store, located at 5234 River Road. A Bethesda store sold a winning lottery ticket last week to a Virginia resident who works in Washington, D.C.
0 kommentar(er)
