sporadic E layer
noun Date: 1949 a layer of ionization occurring irregularly within the E region of the ionosphere

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • sporadic e layer — noun Usage: usually capitalized E : a layer of ionization occurring irregularly within the E region of the ionosphere at heights of approximately 60 miles above the surface of the earth and occasionally being capable of reflecting radio waves of… …   Useful english dictionary

  • sporadic E — sporadic E, an area of high ionization in the E layer of the ionosphere which interferes with the normal reflection of short wave radio …   Useful english dictionary

  • E region — noun a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length • Syn: ↑Heaviside layer, ↑Kennelly Heaviside layer, ↑E layer • Instance Hypernyms: ↑region, ↑part • Part Holonyms: ↑ …   Useful english dictionary

  • E region — noun Date: 1930 the part of the ionosphere occurring between about 55 and 80 miles (90 and 130 kilometers) above the surface of the earth and containing the daytime E layer and the sporadic E layer …   New Collegiate Dictionary

  • E region — The region of the ionosphere in which the E layer tends to form. The region lies between 60 and 90 miles (100–150 km). The region reflects electromagnetic energy from 100 kHz to 30 MHz and plays an important role in long distance radio… …   Aviation dictionary

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