Snake’s sound

This crossword clue is for the definition: Snake’s sound.
it’s A 13 letters crossword puzzle definition.
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Possible Answers: HISS.

Last seen on: USA Today Crossword – Nov 19 2020

Random information on the term “HISS”:

Electromagnetic hiss is a naturally occurring Extremely Low Frequency/Very Low Frequency electromagnetic wave (i.e., 300 Hz – 10 kHz) that is generated in the plasma of either the Earth’s ionosphere or magnetosphere. Its name is derived from its incoherent, structureless spectral properties which, when played through an audio system, sound like white noise (hence the onomatopoetic name, “hiss”).

Hiss may be observed in any of several varieties depending on local time and L-shell of the observer:

There are several proposed generation mechanisms for plasmaspheric hiss in particular, including:

HISS on Wikipedia