E region
- noun
- Specialized
:
región E
- Some radio frequencies can travel long distances at night due to reflection from the E region of the ionosphere.
Examples
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Scientists tracked the changes in the E region to study how solar activity affects radio communication.
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The altitude of the E region typically varies depending on solar and atmospheric conditions.
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The E region is crucial for radio communications.
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I learned about the E region in my science class.
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Scientists tracked the changes in the E region to study how solar activity affects radio communication.
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Some radio frequencies can travel long distances at night due to reflection from the E region of the ionosphere.
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The altitude of the E region typically varies depending on solar and atmospheric conditions.
Synonyms
A layer of the upper atmosphere about 80 to 145 kilometres above the ground that reflects medium-length radio waves
A layer high above Earth that bounces back radio waves for long-distance radio
A layer of upper air high above the Earth that reflects medium-length radio waves
How High
Surface Forms
Morphology
E + region
A B1 learner who knows 'E' as a letter and 'region' as an area will readily infer that this phrase denotes a region labelled 'E' (the naming pattern is transparent). However, the specific technical sense referring to a layer of the ionosphere that reflects medium-length radio waves is specialized and cannot be derived from the constituents alone, so full meaning requires domain knowledge.
Etymology
The noun E region comes from early radio work when scientists divided the sky into layers, named one layer E, and called the area a region that 'reflected' medium radio waves. So E region means the part of the upper air that reflects medium-length radio signals.
