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short waves |
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short waves, radio waves whose frequencies range from about 3 to 25 megahertz (Mhz), corresponding roughly to the high-frequency band (see radio frequency radio frequency, range of electromagnetic waves with a frequency or wavelength suitable for utilization in radio communication. Some of these waves serve as carriers of the lower-frequency audio waves; others are modulated by video or digital information. ..... Click the link for more information. ). When they impinge on certain layers of the ionosphere, short waves are largely reflected back toward the earth. By one or more reflections between the earth and the ionosphere, a short-wave radio signal can be received at long distances from the transmitter. |
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Take one thing at a time, and add stuff to your agenda in short waves. Short waves are like melt fracture but occur inside the film and may appear as uniform haze or as visible waves. There will be no change in the previously announced certification schedule of three major certification waves and nine short waves for 2003. |
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