Heaviside layer

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Definition

Noun: * Heaviside layer: A specific region within the Earth's ionosphere, located approximately 80 to 110 kilometers (50 to 70 miles) above the Earth's surface. It is characterized by its ability to reflect medium-frequency radio waves, enabling long-distance radio communication by bouncing signals back to Earth.

Usage

The term is used as a proper noun to name a specific atmospheric layer with distinct electrical properties. * Early transatlantic radio communication was made possible by the reflection of signals from the Heaviside layer. * Scientists study the density of the Heaviside layer to understand its effects on radio propagation.

Advanced Usage
  • The Heaviside layer is scientifically synonymous with the E region (or E-layer) of the ionosphere. It is named after the English physicist Oliver Heaviside, who, along with Arthur Kennelly, independently predicted its existence.
  • Its reflective properties are crucial for AM (Amplitude Modulation) radio broadcasting, allowing signals to travel beyond the horizon.
Variants and Related Words
  • Kennelly-Heaviside layer: An alternative name acknowledging both Arthur Kennelly and Oliver Heaviside.
  • E region / E-layer: The modern scientific designation for this ionospheric layer.
  • Ionosphere: The broader region of the Earth's upper atmosphere that contains the Heaviside layer and is ionized by solar radiation.
Synonyms
  • E-layer
  • E region
  • Kennelly-Heaviside layer
Related Phrases
  • Atmospheric reflection: The general process by which the Heaviside layer functions.
  • Skywave propagation: The technical term for long-distance radio wave travel using ionospheric reflection.
Noun
  1. a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length

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