By being able to measure electron density with high accuracy in atmospheric pressure low - temperature plasma, it is no longer necessary to rely solely upon experience and trial and error. (sciencedaily.com)
Their signature can be detected in the upper atmosphere as either fluctuations in air pressure or as electron density disruptions. (sciencedaily.com)
At a high enough electron density, each cloud reflects high - frequency radio waves like a mirror. (newscientist.com)