Kennelly–Heaviside layer

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What Wikipedia says

The Heaviside layer, sometimes called the Kennelly–Heaviside layer, named after Arthur E. Kennelly and Oliver Heaviside, is a layer of ionised gas occurring roughly between 90 and 150 km (56 and 93 mi) above the ground — one of several layers in the Earth's ionosphere. It is also known as the E region.

Excerpt from the Wikipedia article “Kennelly–Heaviside layer”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: IonosphereLayers-NPS.gif: Naval Postgraduate School derivative work: Phirosiberia (talk), CC BY-SA 3.0, via Wikimedia Commons.