e layer
Definition
- Noun:
- A region of the ionosphere: The E layer is a specific atmospheric layer located approximately 50 to 90 miles (80 to 145 kilometers) above the Earth's surface. It is part of the ionosphere, which is ionized by solar radiation.
- A radio wave reflector: This layer is known for its ability to reflect medium-frequency radio waves, which is crucial for certain types of long-distance radio communication.
Usage Examples
- Noun:
- The stability of the E layer affects AM radio broadcast reception at night.
- Scientists study the E layer to understand how solar activity influences radio propagation.
- The signal bounced off the E layer, allowing it to travel beyond the horizon.
Advanced Usage
"E-layer critical frequency": The maximum frequency at which a radio wave can be transmitted vertically and still be reflected by the E layer.
- The E-layer critical frequency varies with the time of day and solar activity.
"Sporadic E layer": Refers to irregular, patchy clouds of intense ionization that can form within the E region, enabling unusual long-distance VHF radio propagation.
- Amateur radio operators sometimes make contact over great distances due to sporadic E layer conditions.
Variants and Related Words
- E region: A synonym often used interchangeably with E layer.
- Kennelly–Heaviside layer: A historical name for the E layer.
- Ionosphere: The broader region of the Earth's upper atmosphere that includes the E layer, along with the D, F1, and F2 layers.
Synonyms
- E region
- Kennelly–Heaviside layer (historical context)
Related Phrases
Layer reflection: The process by which the E layer reflects radio waves back to Earth.
- Layer reflection from the E region makes medium-wave radio possible over long distances.
Ionospheric layer: A general term for structured regions within the ionosphere, such as the D, E, and F layers.
- Each ionospheric layer has distinct characteristics and effects on radio waves.
Noun
-
a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
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