WEBVTT

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The WAVES instrument is basically a radio.

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It tunes to frequencies all the way from 50 Hz, 

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which is near the bottom of the audio frequency range,

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up to above 40 mHz,

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which is above the limit of the radio emissions that Jupiter generates.

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The WAVES instrument has two sensors.

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One is designed to measure the electric field component of these waves

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and it looks like a pair of rabbit-ear antennas

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that you might have had on a TV when you were a kid.

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Except these are about ten feet long.

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The other sensor is a much smaller device,

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it's about ten inches long,

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and it's basically a coil of wire.

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It has about ten thousand turns on it

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and it's designed to measure the magnetic fluctuations of waves.

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So these two sensors are used by the receivers

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to study the various phenomenon,

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particularly in Jupiter's polar magnetosphere.

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For example, the maximum frequency of the radio emissions that we detect

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told us what the magnetic field strength was

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in the magnetosphere of Jupiter.

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Long before any spacecraft arrived,

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Juno was designed to actually to go to another planet

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and make the first measurements of

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an extra-terrestrial auroral region in great detail.

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So I think we learn about ourselves

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by studying other environments in the universe.