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| Definition Of: |
ionosphere
The region of the Earth's upper atmosphere containing a small percentage of free electrons and ions produced by photoionization of the constituents of the atmosphere by solar ultraviolet radiation at very short wavelengths (less than 1000 angstroms). The ionosphere significantly influences radiowave propagation of frequencies less than about 30 MHz.
That part of the atmosphere, extending from about 70 to 500 kilometers, in which ions and free electrons exist in sufficient quantities to reflect and/or refract electromagnetic waves. [After JP1 ] 
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Technology Dictionary INDEX:
List of Terms: Terms beginning with "A", Page 1 |
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Page Number:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 A: Page 1 of 14.
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