Cellphones could warn of imminent lightning strike

2019-03-01 10:20:06

IT COULD become an indispensable safety device for outdoor enthusiasts – a cellphone that warns you to take cover if lightning is heading your way. Lightning can pose a major risk to people taking part in outdoor pursuits, such as golfing. So Nokia proposes a warning system that uses the fact that a lightning bolt is an electric current that emits radio waves. Each bolt produces frequencies between 10 hertz and 5 gigahertz, and the distribution of these signals depends on how far away the lightning is. The multiple receivers in a phone, such as Bluetooth, FM, tri-band GSM,