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| Home » Plasma Dictionary - W » Whistler |
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| Plasma Dictionary - Terms Started With Alphabet W |
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Term : Whistler
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Definition : A plasma wave which propagates parallel to the magnetic field produced by currents outside the plasma, at a frequency less than that of the electron cyclotron frequency, and which is circularly polarized, rotating about the magnetic field in the same sense as the electron gyromotion. The whistler is also known as the electron cyclotron wave. The whistler was discovered accidentally during World War I by large ground-loop antennas intended for spying on enemy telephone signals. Ionospheric whistlers are produced by distant lightning, and get their name because of a characteristic descending audio-frequency tone, which is a result of the dispersion relation for the wave: lower frequencies travel somewhat slower, and therefore arrive at the detector later.
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| Planet Dictionary |
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A planet (from the Greek planete means "wanderer" or
more forcefully "vagrant, tramp") is an object in orbit around a star
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A science that deals with the history of the earth as recorded in rocks.
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