"E region." YourDictionary, n.d. Web. 19 January 2019. <https://www.yourdictionary.com/e-region>.
E region. (n.d.). Retrieved January 19th, 2019, from https://www.yourdictionary.com/e-region
The region of the ionosphere that lies approximately 90 to 150 km (56 to 93 mi) above the Earth's surface. This region may affect long-distance communications because it influences radio waves in the 1-3 megahertz range. Also called E layer