E layer

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Definition
  1. 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
  1. a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length

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