heaviside layer
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
-
a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
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